What is this type of error

QMoney Module 6
#1

Unable to delete file: /home/crio-user/workspace/smartjayansh-ME_QMONEY/qmoney/build/test-results/test/binary/.nfsc0d103786242a8e80000001f

#2

What is leading to this error?

#3

./gradlew test ---------------------

Why it is not deleting this file?
#4

Did you do something in the terminal and forcefully close it (CTRL + c)?

#5