Hi, Can you please let us know the AEM version and share with us AEM error.log?
From top level: The error indicates there is another process in the middle of using the BundleContext and other thread trying to stops the bundle, hence the BundleContext will become invalid. Complete logs could give better picture or you can find yourself by analyzing what is happening in parallel.
I feel like this question is beyond the scope of the community as it required much of debugging. But if you will not get response in few days, then i would suggest you to File a daycare for further assistance.