Error in Ascend environment： dlopen libcust_opapi.so failed

[jianc59399]

Describe the bug
run command：python main.py --mode run_test --model_name resnet50
failed cases:
FAILED gencases/resnet50_case/test_resnet50_max_pool2d_max_pool2d.py::TestMresnet50Smax_pool2dFmax_pool2d::test_max_pool2d_1
FAILED gencases/resnet50_case/test_resnet50_max_pool2d_max_pool2d.py::TestMresnet50Smax_pool2dFmax_pool2d::test_max_pool2d_2
error:
/data/DIOPI/impl/build/_deps/op_plugin-src/op_plugin/utils/op_api_common.h:GetOpApiLibHandler:103 [PTA]:"dlopen libcust_opapi.so failed, error:(null).
What is this libcust_opapi.so error related to?