Check failed: (context != nullptr) is false: No OpenCL device

when i run the tvm/apps/benchmark of mali GPU i got the error below: RPCError: Error caught from RPC call: [09:33:11] /home/temp/tvm/src/runtime/opencl/opencl_device_api.cc:120:

An internal invariant was violated during the execution of TVM. Please read TVM’s error reporting guidelines. More details can be found here: https://discuss.tvm.ai/t/error-reporting/7793.

Check failed: (context != nullptr) is false: No OpenCL device