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Willi Fuchs

Fatal Error F2039 - Could not create output file

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I am using the IDE of Delphi 10.1 under Windows 10.

After several tests with a program under development which seemed to work quite well, I suddenly got an error message F2039 which says: Could not create output file.

There are no other error messages from the compiler, except some irrelevant hints (such as:  variable....never used).

The problem is, the program was started and running correctly a short time before, and since then I did not change anything in the code.

I have no idea where to look for a solution.


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Have you checked if an instance of the output app is still running?
Does the problem persist if you restart the IDE?


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