https://community.blueprism.com/t5/Product-Forum/Object-reference-not-set-to-an-instance-of-an-object/m-p/87105#M37866 Thanks Denis Dennehy. Yes,It is working Thu, 04 Jan 2018 13:42:00 GMT MallikarjunaBal 2018-01-04T13:42:00Z https://community.blueprism.com/t5/Product-Forum/Object-reference-not-set-to-an-instance-of-an-object/m-p/87103#M37864  what is the meaning this error and how solve this error ?? Failed to perform step 1 in Navigate Stage 'uncheck' on page '08-download files' - Object reference not set to an instance of an object. if I run the object  in object studio it is working fin but if  I run it from process studio  it  is not working there I am getting above error. Reply soon.. Wed, 03 Jan 2018 15:35:00 GMT https://community.blueprism.com/t5/Product-Forum/Object-reference-not-set-to-an-instance-of-an-object/m-p/87103#M37864 MallikarjunaBal 2018-01-03T15:35:00Z https://community.blueprism.com/t5/Product-Forum/Object-reference-not-set-to-an-instance-of-an-object/m-p/87104#M37865 Working in object studio but not when called from Process or Control room indicates to me that your wait stage logic is not implemented correctly.   My first recommendation would be to revisit your action and ensure you have an intelligent waiting logic that ensure the screen is ready before you navigate within it. Wed, 03 Jan 2018 17:51:00 GMT https://community.blueprism.com/t5/Product-Forum/Object-reference-not-set-to-an-instance-of-an-object/m-p/87104#M37865 Denis__Dennehy 2018-01-03T17:51:00Z https://community.blueprism.com/t5/Product-Forum/Object-reference-not-set-to-an-instance-of-an-object/m-p/87105#M37866 Thanks Denis Dennehy. Yes,It is working Thu, 04 Jan 2018 13:42:00 GMT https://community.blueprism.com/t5/Product-Forum/Object-reference-not-set-to-an-instance-of-an-object/m-p/87105#M37866 MallikarjunaBal 2018-01-04T13:42:00Z