It seems cause by the background ss.exe.
Please take a look on the attach image file.
while this error happen, I can do nothing but to end the process.
Message is :
Operation failed. Unable to open uer login file
Every about 10 minutes, the error occured.
But yesterday, I didn't find this error.
Maybe the network environment is a little poor, but the idea shoule let me continue my job and leave the error alone.