Can any one plz tell me what is this Problem

when I click build application then this error show, Kindly help me what is the problem and how to fix it

Attach Necessary Block Images and Files

How many screen in this app

Two screen hain iss ma

Ok Wait I am telling this to staff

Refresh the tab and try again.

I have faced this problem two times but the reason was different.

Reason 1:- For some imported extensions.
Reason 2:- For some non-completed blocks.

Solutions:- At first check your all blocks, if there are any duplicate blocks then simply delete them.

If you have no error in blocks then try the second method, remove one extension and try to export your app, if you get this same error then try this repeatedly.

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To get more information, click on details when you getting an error then attach the screenshot here.