The error is in file that has name "8.c".
The error is probably on line 9 of that file. (Your post on this thread has it on line 8.)
The line with error has binary operator <=.
One of the operands has type 'int' and the other has type 'complex int'.
One should be able to locate both operands from the code. Then one can figure out how the intent (by author) and the interpretation (by compiler) of the code differ.