Unfortunately, sometimes all you get is the system error code but nothing about what the code means!
PressCtrl+Fto quickly find your error code in this table.
The “fix” here would be to simply not make a run at encrypt files.

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Totally separate steps are required to address this error.
A cursory look through the above table provides lots of other examples of this.
There are, however, a few basic things you could make a run at fix most problems.
One recommendation is to just repeat what you did to see if the error reappears.
It could have been a software fluke that doesn’t need any other attention.
If you could’t fix the system error yourself, reach out to the software developer.