CRC compiler-error message

Hi, guys,

I am following the "CRC compiler user guide" to see the CRC generator and checker simulation.

I got the following error message when I was trying to compile and simulate the crcdemo.v

error: can't generate netlist output files because the file "d:/fyp_extra/crc_project/testbench/new_project_testbench/incremental_db/compiled_partitions/crcdemo.root_partition.map.atm" is an opencore plus time-limited file

error: can't generate netlist output files because the file "d:/fyp_extra/crc_project/testbench/new_project_testbench/incremental_db/compiled_partitions/crcdemo.root_partition.map.atm" is an opencore plus time-limited file

error: can't generate netlist output files because the file "d:/fyp_extra/crc_project/testbench/new_project_testbench/incremental_db/compiled_partitions/crcdemo.root_partition.map.atm" is an opencore plus time-limited file

error: can't generate netlist output files because the file "d:/fyp_extra/crc_project/testbench/new_project_testbench/incremental_db/compiled_partitions/crcdemo.root_partition.map.atm" is an opencore plus time-limited file

It seems like the OpenCore plus feature expires? I don't quite get it.

Thanks in advance