Code generation failed: Open error report.

When I try to generate C + + code via Matlab Coder I get this error message:

>> coder -build asdasd.prj ??? Unknown compiler ''.

Error in ==> miltiplicacion Line: 1 Column: 1 Code generation failed: Open error report.

the results window on the Matlab or file explorer generated in C + + don't appear and I perform all the steps correctly, what can I do wrong?

Looking forward hearing from your answers, Eduard