[HELP] UNetWeaver error: Exception :System.IO.IOException: Sharing violation on path

The UNetWeaver error: Exception :System.IO.IOException** and Failure generating network code has been appearing from time to time, especially when I tried to build and run it. After which, I could not longer enter playmode as Unity wants me to fix the error.

However, after I close unity and re-open it a few times, the error went away and I was able to enter playmode with no issues. Yet, this error always pop out whenever I try to build it.

I believe it is regarding networking issues yet I do not have any idea how to solve it.
Please help!

got the same problem and it doesn´t vanish and almost every script is suddenly broke because of this…