solved svn: E155037: Previous operation has not finished; run 'cleanup' if it was interrupted

I was trying to update RADIUSdesk using svn on UBUNTU server 16.04. This took some time and then at a file it stalled. I cancel it by pressing ctrl+c and try to run it again but was giving this error message then svn: E155037: Previous operation has not finished; run 'cleanup' if it was interrupted To solve this error do the following
1. Go to the directory/ folder you were checkout svn
2. and run sudo svn cleanup
3. done

Now you can run the svn checkout like a charm ;)

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