When running howto_deploy/run_example.sh, something wrong occurs with tvm._api_internal?

I have compiled TVM runtime on arm cpu without cuda and llvm(from master branch of TVM), and set PYTHONPATH in bashrc. When Deploy TVM module using C++ API, there is something wrong with _api_internal. Something I forget to do ?

jetbot@jetbot:~/marong/tvm_bak/apps/howto_deploy$ sh run_example.sh
Build the libraries..
python3 prepare_test_libs.py
Traceback (most recent call last):

  File "prepare_test_libs.py", line 38, in <module>
    prepare_test_libs(os.path.join(curr_path, "./lib"))

  File "prepare_test_libs.py", line 22, in prepare_test_libs
    n = tvm.var("n")

  File "/home/jetbot/marong/tvm_bak/python/tvm/api.py", line 190, in var
    return _api_internal._Var(name, dtype)

AttributeError: module 'tvm._api_internal' has no attribute '_Var'

Makefile:40: recipe for target 'lib/test_addone_sys.o' failed
make: *** [lib/test_addone_sys.o] Error 1
Run the example
Run the deployment with all in one packed library...
run_example.sh: 26: run_example.sh: lib/cpp_deploy_pack: not found
Run the cpp deployment with all in normal library...
run_example.sh: 29: run_example.sh: lib/cpp_deploy_normal: not found
Run the python deployment with all in normal library...
Traceback (most recent call last):

   File "python_deploy.py", line 43, in <module>
     mod_dylib = tvm.module.load("lib/test_addone_dll.so")

   File "/home/jetbot/marong/tvm_bak/python/tvm/module.py", line 299, in load
     return _LoadFromFile(path, fmt)

   File "/home/jetbot/marong/tvm_bak/python/tvm/_ffi/_ctypes/function.py", line 207, in __call__
   raise get_last_ffi_error()

tvm._ffi.base.TVMError: Traceback (most recent call last):
  [bt] (3) /home/jetbot/marong/tvm_bak/build/libtvm_runtime.so(TVMFuncCall+0x70) [0x7f9b380758]
  [bt] (2) /home/jetbot/marong/tvm_bak/build/libtvm_runtime.so(+0x4d008) [0x7f9b39f008]
  [bt] (1) /home/jetbot/marong/tvm_bak/build/libtvm_runtime.so(tvm::runtime::Module::LoadFromFile(std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&)+0x3ac) [0x7f9b39db54]
  [bt] (0) /home/jetbot/marong/tvm_bak/build/libtvm_runtime.so(+0x37450) [0x7f9b389450]
  File "/home/jetbot/marong/tvm/src/runtime/dso_library.cc", line 84
TVMError: Check failed: lib_handle_ != nullptr: Failed to load dynamic shared library lib/test_addone_dll.so lib/test_addone_dll.so: cannot open shared object file: No such file or directory