1.Blinky 'make_impl' command gives 'FATAL ERROR: Input CLK_REF of net 86 must have dedicated CLK pin connection'

[TarikHamedovic]

When running make impl command in terminal in 1.Blinky/3.build folder there is a an error that can be seen in the impl.log file: 'FATAL ERROR: Input CLK_REF of net 86 must have dedicated CLK pin connection'

CLK_REF is only used in the blink.v with the PLL module, so that may be a clue.
Also there may be an error in the makefile.

[TarikHamedovic]

The problem was the .ccf Constraint file had a typo.
All is okay now.