Description
This error may be seen in the Quartus® II software version 11.0 and later when the report_skew (Synopsys Design Constraint (SDC) command is run in the TimeQuest timing analyzer without specifying any paths or clocks.
Resolution
To work around this problem, ensure a path or clock is defined when running the report_skew command.
For more information on the syntax of the report_skew SDC command and example usage, refer to Quartus II Help.
This problem is fixed beginning with the Quartus II software version 12.0.