E2038 Illegal character in input file - '%s' (%s) (Object Pascal)
The compiler found a character that is illegal in Object Pascal programs.
This error message is caused most often by errors with string constants or comments.
program Produce; begin Writeln("Hello world!"); (*<-- Error messages here*) end.
Here a programmer fell back to C++ habits and quoted a string with double quotes.
program Solve; begin Writeln('Hello world!'); (*Need single quotes in Object Pascal*) end.
The solution is to use single quotes. In general, you need to delete the illegal character.