monkey test " Sending Flip keyboardOpen=false" cause IOException

adb shell monkey -p com.eisoo.anycontent --kill-process-after-error --throttle 300 -s 600 -v -v -v 1000 > .\log.txt

after it finished

in the log file I found many IOException like bellow:

"Sleeping for 300 milliseconds :Sending Flip keyboardOpen=false Got IOException performing flipjava.io.IOException: write failed: EINVAL (Invalid argument)

Sleeping for 300 milliseconds"

from this information,I think this maybe caused by

close soft keyboard,but I am not sure

please give me some advice ,no matter the root cause or some other suggestion

on how to look for root cause.