topic Required pattern not supported by self or ancestor - grid pattern in Product Forum

Required pattern not supported by self or ancestor - grid pattern

RicardoFerreira — Mon, 15 Feb 2021 15:23:00 GMT

Hello!

I have this error only on windows server "Required pattern not supported by self or ancestor - grid pattern" , there is any fix to this error? this appers when i try to get all rows from a UI table

(Blue Prism 6.9)

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Ricardo Ferreira
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RE: Required pattern not supported by self or ancestor - grid pattern

Ben.Lyons1 — Tue, 16 Feb 2021 09:13:00 GMT

Hi Ricardo,

It's difficult to know without seeing it, but I would say it sounds like what you're trying to read can't be recognised as a table. The phrase makes mention that it can't find a grid pattern (a basic table structure), which may mean that even though you can see a table, it's not presented as one in the code.

It may take some trial an error with things like using other spy methods, using the UI Automation Navigator (found by clicking the arrow next to Identify) or perhaps spying 1 cell at a time and seeing if you can move throughout the table by changing the Ordinal/Match Index.

I hope that helps.

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Ben Lyons
Product Consultant
Blue Prism
UK
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RE: Required pattern not supported by self or ancestor - grid pattern

RicardoFerreira — Tue, 16 Feb 2021 10:15:00 GMT

Hi Ben,

Thank you very much for your answer.

The software as detected the element has table by default (UI Automation Navigator), i didn't change anything.

It is strange that this error only appears on windows server and not on windows 10.

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Ricardo Ferreira
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RE: Required pattern not supported by self or ancestor - grid pattern

Ben.Lyons1 — Tue, 16 Feb 2021 10:20:00 GMT

Hi Ricardo,

I'm not sure it's recommended to run web browser based processes on a machine using Windows Server. Is there any particular reason you're doing this over a Windows 10 machine?

It could be down to how the application installs differently, or how the data is presented via that OS.

Thanks

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Ben Lyons
Product Consultant
Blue Prism
UK
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RE: Required pattern not supported by self or ancestor - grid pattern

RicardoFerreira — Tue, 16 Feb 2021 10:30:00 GMT

Hi again 🙂

Windows 10 - Dev machine
Windows Server - Prod machine.

"I'm not sure it's recommended to run web browser based processes on a machine using Windows Server" - Really? why?

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Ricardo Ferreira
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RE: Required pattern not supported by self or ancestor - grid pattern

Ben.Lyons1 — Tue, 16 Feb 2021 10:46:00 GMT

Hi,

It's always best to have your dev and prod environments match as closely as possible, otherwise it makes root cause analysis extremely difficult.

My apologies, I have looked into the OS usage in more detail and it will work perfectly well for your purposes. I would just be curious why you are using that instead of Windows 10, what a standard business user would likely have installed.

I would recommend harmonising your dev and prod environments.

Thanks

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Ben Lyons
Product Consultant
Blue Prism
UK
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RE: Required pattern not supported by self or ancestor - grid pattern

RicardoFerreira — Tue, 16 Feb 2021 10:51:00 GMT

I used windows 10 only as a test since I was getting this error on windows server. It is strange because the UI detects everything correctly and only when it goes to get the table rows does it give that error, otherwise everything goes smoothly .

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Ricardo Ferreira
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RE: Required pattern not supported by self or ancestor - grid pattern

Ben.Lyons1 — Tue, 16 Feb 2021 11:00:00 GMT

So I see from your previous note that it works fine on Windows 10. Which continues to lead me to believe that the web browser is in some way different when installed on Windows Server.

What alternative spy methods have you tried?

Have you launched the application navigator to see how it's structured? If so, have you check for other table elements?

Have you tried spying a table on another web page to see if you get the same issue?

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Ben Lyons
Product Consultant
Blue Prism
UK
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RE: Required pattern not supported by self or ancestor - grid pattern

RicardoFerreira — Tue, 16 Feb 2021 11:25:00 GMT

Has can you see in attached image, the element its define as table. (chrome last version)

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Ricardo Ferreira
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RE: Required pattern not supported by self or ancestor - grid pattern

Ben.Lyons1 — Tue, 16 Feb 2021 11:33:00 GMT

Thank you.

Is that on Windows Server?

What alternative spy methods have you tried?

Have you tried spying a table on another web page to see if you get the same issue?

Have you tried a different web browser?

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Ben Lyons
Product Consultant
Blue Prism
UK
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RE: Required pattern not supported by self or ancestor - grid pattern

RicardoFerreira — Tue, 16 Feb 2021 11:39:00 GMT

Is that on Windows Server? - Yes

What alternative spy methods have you tried? - Only this method give me the results that i want

Have you tried spying a table on another web page to see if you get the same issue? - No

Have you tried a different web browser? - I need to use the chrome.

I have the same configuration (and install method) on both windows .

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Ricardo Ferreira
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RE: Required pattern not supported by self or ancestor - grid pattern

Ben.Lyons1 — Tue, 16 Feb 2021 11:48:00 GMT

Thank you for looking at these.

Please can you try another table on the same application/web site and one on another web site?

Why can't you use Edge?

When you say the same configuration, I assume that means the same version of Chrome and plug in. What version of Chrome are you on?

What application/web site are you trying to read?

Sorry for so many questions, I'm really hoping we can get to the bottom of this.

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Ben Lyons
Product Consultant
Blue Prism
UK
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RE: Required pattern not supported by self or ancestor - grid pattern

RicardoFerreira — Tue, 16 Feb 2021 11:59:00 GMT

Please can you try another table on the same application/web site and one on another web site? - I only have this problem when i need to get all information from table from a popup window. if i try to get the table from the main page (chrome), works fine.

Why can't you use Edge? - i have tried firefox and IE and i can't have some elements.

What version of Chrome are you on? Version 88.0.4324.150 (Official Build) (64-bit)

Same configuration and installation on Blue Prism.

What application/web site are you trying to read? BMC Remedy 🙂

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Ricardo Ferreira
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RE: Required pattern not supported by self or ancestor - grid pattern

Ben.Lyons1 — Tue, 16 Feb 2021 13:05:00 GMT

Thanks Ricardo,

I may have an idea to try then. I suspect that when the pop up window appears, Blue Prism isn't as able to identify elements in it as it's a new window.

To test this theory, have you tried (can you try), detaching from the main window, then attaching to the pop up window? Be sure to use the specific window text.

Once the pop is closed, you will need to re-attach to the main window. I've had to do similar on other websites.

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Ben Lyons
Product Consultant
Blue Prism
UK
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RE: Required pattern not supported by self or ancestor - grid pattern

RicardoFerreira — Tue, 16 Feb 2021 13:34:00 GMT

unfortunately I didn't quite understand the idea. Can you give me an example please.

one of the reasons for me to use UI Automation is because of that, the blue prism cannot access the popup as part of the main frame. in this project I have used all types of spy and they all work both in the main frame and in popups, except this case of obtaining a table from UI Automation

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Ricardo Ferreira
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RE: Required pattern not supported by self or ancestor - grid pattern

Ben.Lyons1 — Tue, 16 Feb 2021 15:01:00 GMT

No problem.

When Blue Prism attaches to a web browser, it connects to a specific window. It can operate between different tabs, but a new window is effectively a new instance of the application. (Take a look at Task Manager and you will see multiple instances of Chrome running)

While on occasion Blue Prism may successfully interact with a pop up, it's not very consistent as it may be looking through several instances of Chrome.

So for this I would recommend creating a new object for the pop up window. This should include actions to attach, carry out the actions needed and detach.

There's more information in the browser automation guide:

3.8 Pop-up Windows
Depending on how the web application has been built, you might need to create a separate business object to interface with a popup window. This will be the case if you see the "A spying error has occurred" error message. A new object will need to be configured to attach to a running instance of the popup, rather than launching something. Pop-up windows may need to be spied using Win32 or AA mode instead of the usual HTML mode. To speed up development, it might be best to build a separate generic object to handle IE pop-up windows.

This can be found on the University, in the module "Working with different application types and Spy Modes".

Let me know how it goes or if you need any further detail.

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Ben Lyons
Product Consultant
Blue Prism
UK
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RE: Required pattern not supported by self or ancestor - grid pattern

RicardoFerreira — Wed, 17 Feb 2021 15:08:00 GMT

Hello again

Unfortunately, this is a dynamic pop-up, so I cannot copy and paste the link and create a new object. I really need to use UI Automation to get this table

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Ricardo Ferreira
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RE: Required pattern not supported by self or ancestor - grid pattern

SharmilShah — Thu, 18 Feb 2021 04:36:00 GMT

@RicardoFerreira I am also facing this issue. Have you got any solution for this problem?

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Sharmil Shah
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RE: Required pattern not supported by self or ancestor - grid pattern

Ben.Lyons1 — Thu, 18 Feb 2021 08:08:00 GMT

Hi Ricardo,

You don't need the URL to create an object.

1. Create a new object that attaches to an application that's already launched, no need to include a URL.
2. Use the main object to navigate to the point at which the pop up appears.
3. Create an action in the new object to attach to the pop up. It will need the process name "chrome" and window title. The window title can include wildcards * where it changes. E.g. If it were Google UK and you wanted to use it on Google IT, write Google*.
4. Once attached respy and recreate the action to read the table.
5. Replace the action in your process, but keeping all the actions from the original objects that work.

Thanks

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Ben Lyons
Product Consultant
Blue Prism
UK
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RE: Required pattern not supported by self or ancestor - grid pattern

RicardoFerreira — Thu, 18 Feb 2021 11:16:00 GMT

Do you have any quick quide / tutorial (pdf / youtube video) with this steps? so far I haven't been able to do what you suggested

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Ricardo Ferreira
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