how to use the -skipFKConst option can only be given with -constraints option

Question

I have used offline migration command to create an SQL scripts but I need to omit the migration of foreign key constraints. So I have used the below commands but getting this error :

'MTK-03000: General Error
java.lang.NullPointerException

One or more schema objects could not be imported during the migration process. Please review the migration output for more details.

Command:

./runMTK.sh -offlineMigration /home/enterprisedb/offline_scripts_for_target/table_ddl
    -targetSchema targetschema -schemaOnly -constraints -skipFKConst
    -tables table_name sourceschema

Please help me how to use skipFKConst.