Compiler Error CS0016
Updated: July 20, 2015
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Could not write to output file 'file' — 'reason'
The compiler could not write to an output file. Check the path to the file to make sure it exists. If a previously built file is already at the location, make sure it is writeable, and that no process currently has a lock on the file. For example,make sure your executable is not running when you attempt to build.