W8081 Void functions may not return a value (C++)
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(Command-line option to suppress warning: -w-voi)
Your source file declared the current function as returning void, but the compiler encountered a return statement with a value. The value of the return statement will be ignored.
Example:
// This HAS to be in a "C" file. In a "C++" file this would be an error void foo() { return 0; // Can't return a value from a void function }