Hi AnastasiosKr
I do not have the DLL file issue, and cannot provoke this error, and thus, not replicate the same error and give you an exact solution to your issue.
But you need to solve this issue somehow, perhaps try to reinstall the office package on your client, and if this doesn't work, reinstall your client OS.
Don't use an infinite loop.
If you have Office Outlook 2007:
Use Blue Prism MapiEx BO's action ""List Mails Within DateTimes"" to get a collection of e-mail ID's. Loop this e-mail ID collection with the Blue Prism MapiEx BO's action ""Get Mail"", remember to specify the ""Move to Sub-Folder"" input of the ""Get Mail"" action, otherwise, you keep reading the same email over and over. So you need to have a sub-folder in your e-mail client you move ""read"" e-mails to, in order to get this solution to work.
If you have newer Office Outlook versions:
You need to get the (Uncertified) MS Outlook VBO referenced in this thread:
https://portal.blueprism.com/forums/technical-queries/faq-hints-tips/mapiex-save-emails-msg-files . Use MS Outlook VBO (uncertified) action ""Get Received Items (since date)"" (or one of the ofther get received items actions) to get a collection of e-mails. With this action, you do not need to move to sub-folder.
You did not mention when in the process, you receive the DLL issue, perhaps this could be related to how you poll the e-mails, with your infinite loop (memory leak or other memory related issues). Try one of the suggested solutions above, depending on which MS office package you have on your client.
Good luck.
BR,
Mustafa