Problem when trying to solve the challenge

[tig13]

When I try to solve the challenge I have an error:
linker command failed with exit code 1 (use -v to see invocation)
Does anybody know how to handle it?

[ibex10]

@tig13

I have an error:

linker command failed with exit code 1 (use -v to see invocation)

Isn’t there any other information accompanying the error message?