First thing you could do is to save this shared library into one directory rather than tmp. For example, tvm_deploy directory. Then you could check the shared library in this tvm_deploy directory. I suggest this way is we could make sure our build target and compile tool work fine. Many times I am asked this question is he sets wrong target or wrong compile tool.
Second thing we could do is to check the directory we upload. I met this error another situation is I can not upload the shared library into the target directory.