hai
are doing batch simulation ?
have u checked the audit option ?
the audit option will let you know that you have assigned the models properly or not?
please check
before doing simulation please check the driver and receiver in the ibis is characterized properly
if an out put pin is configured as input or if a bidirectional pin is configured as input you may get this error which net the error is coming just check the ibis
do audit only and check if the models are proper