About autoTVM Cannot find config for target

When I used autoTVM to tune a matmul for 1024*1024, the warning is as followed.

Cannot find config for target=llvm -keys=cpu -mtriple=x86_64-conda-linux-gnu, workload=(‘tutorial/matmul’, 1024, 1024, 1024, ‘float64’). A fallback configuration is used, which may bring great performance regression.

And I find the log for autoTVM is empty after the program. Is the version of TVM a reason for this error as I used this example of autoTVM for matmul 2 years ago?