About SVN Unknown error
Answered
Hey
Is there somebody had the same problem like me? when I want to refresh my SVN Repository ,the IDEA where note me Unknown error,just like the picture 
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Check IDE logs for more details - see https://intellij-support.jetbrains.com/hc/en-us/articles/207241085-Locating-IDE-log-files
Alternatively, submit a request to https://youtrack.jetbrains.com/issues/IDEA with the logs attached.
My idea log show “[0x7FFA889E8070] ANOMALY: meaningless REX prefix used”，I dount know how to deal
Please clarify where exactly the error occurs.
Googling the error shows a lot of results related to AV software. Probably, your AV is trying to check the svn calls IDE does and causes such failures. Try disabling all AV software and check if it makes any difference.
I encounter the same error, and the solution is listed below:
https://github.com/microsoft/terminal/issues/6391
For me, that `ANOMALY: use of REX.w is meaninglessoffen` happends after updating Windows to 20H2.