Eclipse Juno build error with "Maven Project Builder"

Question

When I try to clean & build my Maven project I get the following error:

Errors occurred during the build.
Errors running builder 'Maven Project Builder' on project '(Hid Project Name)'.
org/apache/maven/project/MavenProject
Errors running builder 'Maven Project Builder' on project '(Hid Project Name)'.
org/apache/maven/project/MavenProject

similarly with the clean all process, it throws the following:

Errors occurred during the build.
Errors running builder 'Maven Project Builder' on project '(Hid Project Name)'.
loader constraint violation: loader (instance of org/eclipse/osgi/internal/baseadaptor/DefaultClassLoader) previously initiated loading for a different type with name "org/apache/maven/plugin/MojoExecution"
Errors running builder 'Maven Project Builder' on project '(Hid Project Name)'.
org/apache/maven/plugin/MojoExecution
Errors running builder 'Maven Project Builder' on project '(Hid Project Name)'.
org/apache/maven/plugin/MojoExecution
Errors running builder 'Maven Project Builder' on project '(Hid Project Name)'.
org/apache/maven/plugin/MojoExecution
Errors running builder 'Maven Project Builder' on project '(Hid Project Name)'.
org/apache/maven/plugin/MojoExecution
Errors running builder 'Maven Project Builder' on project '(Hid Project Name)'.
org/apache/maven/plugin/MojoExecution
Errors running builder 'Maven Project Builder' on project '(Hid Project Name)'.
org/apache/maven/plugin/MojoExecution
Errors running builder 'Maven Project Builder' on project '(Hid Project Name)'.
org/apache/maven/plugin/MojoExecution
Errors running builder 'Maven Project Builder' on project '(Hid Project Name)'.
org/apache/maven/plugin/MojoExecution
Errors running builder 'Maven Project Builder' on project '(Hid Project Name)'.
org/apache/maven/plugin/MojoExecution
Errors running builder 'Maven Project Builder' on project '(Hid Project Name)'.
org/apache/maven/plugin/MojoExecution

Any ideas what causes this?

Answer 1

If you are using external maven check if that is selected

Also try deleting .m2 and check settings file over there if it is pointing to correct place in localRepository tag

C:\Users\sunny.m2\repository