When Running PlanAhead and importing an NGC file, it fails to convert to EDIF and gives the following error:
If the ngc is converted with the ngc2edif command via the command line, it converts the file but the format is unreadable to PlanAhead.
This issue has been fixed in PlanAhead 14.4.
Lines in the EDIF file that are causing the problem might look like the following:
Work-around: If constrains from the code are defined in HDL, try moving them into the .ucf file.