giexec cannot parse IPlugin layer


I have a tensorRT model with PLugin layers. However, if I try to run ./giexec with the deploy.prototxt, the giexec engine cannot parse the IPlugin layers. See error below.

deploy: deploy.prototxt
output: oBlob
could not parse layer type IPlugin
Engine could not be created
Engine could not be created

If anyone has any ideas, how to parse it, please suggest.