AttributeError: module 'tornado.web' has no attribute 'asynchronous'

Hello,

I am trying to run an application in the JupyterLab environment and am getting the following error:
AttributeError: module ‘tornado.web’ has no attribute ‘asynchronous’

I have seen a lot of solutions online involve both tornado and nbconvert but changing the versions of those for me has not solved the problem. My current version of torando is 6.1 and nbconvert is 6.0.7. I appreciate any and all help!