[Solved]unknown error in pom.xml

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

When you Import any project then you will get issue
so you need to update your maven
add this
<properties>
<java.version>1.8</java.version>
<maven-jar-plugin.version>3.1.1</maven-jar-plugin.version>
</properties>
update maven