To clear the warning, return to the WITB section of your return and select No to the question "Do you want to see if you qualify for the Working Income Tax Benefit?".
To return to the WITB section of your return,
As a student, for some reason turbo tax is giving me the WCB
Have you already put in your tuition amounts? Often TurboTax will add the Canada Workers Benefit (CWB) (aka the Working Income Tax Benefit) when you enter in employment income, but then remove it when you enter your tuition information.
Also, if you were only a part time student, or you were full time but had an eligible dependant, you may still qualify for the CWB.