Take the 2-minute tour ×  I had my LayoutConstraints working
fine, then all of a sudden I started getting this when adding
Constraints to my view.      *** Terminating app due to uncaught
exception 'NSInvalidArgumentException', reason: '***
+[NSLayoutConstraint constraintWithItem:attribute:relatedBy:toIt
em:attribute:multiplier:constant:]: Constraint must contain a
first layout item' *** First throw call stack: (0x7cd012
0x2017e7e 0x7ccdeb 0xde6bf1 0x9c487 0x994a3 0x414fb 0x20224
0x5c6c0 0xc30e83 0x78c376 0x78be06 0x773a82 0x772f44 0x772e1b
0x28eb7e3 0x28eb668 0x149465c 0x2cfd 0x2c25) libc++abi.dylib:
terminate called throwing an exception  And there exists no
immediate documentation on the internet or on the Apple Docs as
to what the error message means.  Just wondering if anyone has
encountered this error, and know what I can do to troubleshoot
it?  share|improve this question add comment  3 Answers  One
more reason for this error/crash can be, the views passed to the
[NSLayoutContraint constraintWithItem ..