Suddenly i can't compile

[dwiandra]

Hi, im new here, and i want to ask something, currently im using QT 5.8.0 on MacOS 10.12.3 (sierra) and Xcode 8.3.2

i just downloaded QT about 2 weeks ago because i want to learn c++, and i haven't got any problem until recently, i was making a project to make like an app for a restaurant, and everything was so smooth until suddenly i hit this kind of error:

• :-1: error: symbol(s) not found for architecture x86_64
• :-1: error: linker command failed with exit code 1 (use -v to see invocation)

i was confused because i check there's no error code in my source, but the weird thing is when i make a new project , its perfectly fine again but not for long, it hit the same error again.

help me please? thank you

[jefftee]

That's a linker error, not a compiler error. Please post the full output from your build...

[dwiandra]

after i check the output it seems that for some reason if i delete the output that QT gave me, it will run again , thank you so much for your time my problem is solved now