Why am I getting Unknown error in line 1 of pom.xml?

Question

Getting unknown error at Line 1 in pom.xml in Eclipse IDE. It was working fine till yesterday, but all of a sudden after updating my project from master and aft

Answer 1

Add 3.1.1 in to properties like below than fix issue

        1.8
        3.1.1

Just Update Project => right click => Maven=> Update Project