RT-Thread studio添加netutils不成功请问是什么原因？

RT Thread studio 添加 netutils 不成功：编译报错
AttributeError: ‘NoneType’ object has no attribute ‘split’:
DoBuilding(TARGET, objs)
EndBuilding(target, program)
GenTargetProject(program)
TargetEclipse(Env, GetOption(‘reset-project-config’), GetOption(‘project-name’))
UpdateCproject(env, project, excluding, reset, prj_name)
HandleExcludingOption(entry, sourceEntries, excluding)
old_excluding = entry.get(‘excluding’).split(‘|’)
请问是什么原因；
在另一工程中可以添加编译成功