Error injecting: org.apache.maven.plugin.war.WarMojo

I had the same problem. I am using Eclipse Jun 2021 release. The problem got resolved after manually configuring one of the recent war plug-ins in POM.xml.

<plugin>
    <groupId>org.apache.maven.plugins</groupId>
    <artifactId>maven-war-plugin</artifactId>
    <version>3.3.1</version>
</plugin>