@yahiya6006
As mentioned above, please use one of below solutions.
(1) update Jetpack to 4.6
or
(2) use TAO 3.21.08 to generate etlt model again based on your tlt model.
$ docker pull nvcr.io/nvidia/tao/tao-toolkit-tf:v3.21.08-py3
$ docker run --runtime=nvidia -it --rm -v yourfolder:dockerfolder nvcr.io/nvidia/tao/tao-toolkit-tf:v3.21.08-py3 /bin/bash
# lprnet export xxx