IP cores in ISE of CORE Generator are written with a .xco extension. IP cores generated in Vivado Design Suite and PlanAhead tool are written with a .xci extension.
An existing .xco IP core can be added to a PlanAhead or Vivado IDE project and used as is. However, when attempting to upgrade the IP core, the PlanAhead or Vivado tools are attempting to upgrade and regenerate at the same time. The upgrade occurs in a newly written .xci file but the parameters from the .cgc file are then incorrectly being used and overwriting these values. This effectively reverses the upgrade and causes the procedure to fail.
Some possible ways to work around this issue are:
The known issues related to this error message have been fixed in Vivado Design Suite 2012.3.