I do not know what Elliot suggested, but is it possible for you to open your windows navigator and move the mendix folder or the application folder to your C:/Users/16176 folder and try to open it again. If this does not work you can try to create a new application with a shorter name then LearnNow Training Management something like LNTM maybe.
Hope this helps
Jelle van Leeuwen
I would highly recommend not to use a OneDrive Path as the App Directory.
We had some trouble to open apps, because somehow IDs or anything changed and then couldn't open the app anymore. And it's a local working copy, so it's not really necessary.
For instance I use just a folder in my local C:\Documents.