Can any one plz tell me what is this Problem

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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