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 property tag

problem resolve

https://medium.com/@saannjaay/unknown-error-in-pom-xml-66fb2414991b