autoware.auto colcon build failed

[sigma020209]

Starting >>> tvm_utility
--- stderr: tvm_utility
Traceback (most recent call last):
File "/usr/lib/python3/dist-packages/colcon_core/executor/init.py", line 91, in call
rc = await self.task(*args, **kwargs)
File "/usr/lib/python3/dist-packages/colcon_core/task/init.py", line 93, in call
return await task_method(*args, **kwargs)
File "/usr/lib/python3/dist-packages/colcon_ros/task/ament_cmake/build.py", line 59, in build
rc = await extension.build(
File "/usr/lib/python3/dist-packages/colcon_cmake/task/cmake/build.py", line 87, in build
rc = await self._reconfigure(args, env)
File "/usr/lib/python3/dist-packages/colcon_cmake/task/cmake/build.py", line 133, in _reconfigure
buildfile = get_buildfile(cmake_cache)
File "/usr/lib/python3/dist-packages/colcon_cmake/task/cmake/init.py", line 114, in get_buildfile
if 'Visual Studio' in generator:
TypeError: argument of type 'NoneType' is not iterable

Failed <<< tvm_utility [0.02s, exited with code 1]
Aborted <<< vesc_ackermann [2.90s]

Summary: 93 packages finished [31.0s]
1 package failed: tvm_utility
1 package aborted: vesc_ackermann
2 packages had stderr output: tvm_utility vesc_ackermann
66 packages not processed
argument of type 'NoneType' is not iterable

What should I do to slove this?