Error: Unable to retrieve data , please select "retry" ... error

Hey there,
I have problems to save my drawings on my One drive.
I’m a theacher and i use sketch up for schools. Lately, my and my studens, are having problems whit saving.
It’s really frustrating: my students are losing there documents. I’m losing them and its hard to keep them motivaded.
Can somebody help please?
When try to save there a message
We were unable to retrieve your data, please select “Retry” below to try again.

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