[FIXED] 'Building workspace' has encountered an error

Issue

Eclipse Luna 4.4.0

Error occurred during the Build

Error instantiating builder 'ord.eclipse.m2e.core.maven2Builder'.
Plug-in org.eclipse.m2e.core was unable to load class org.eclipse.m2e.core.internal.builder.MavenBuilder
An error occurred while automatically activating bundle org.eclipse.m2e.core (547).
Plug-in org.eclipse.m2e.core was unable to load class org.eclipse.m2e.core.internal.builder.MavenBuilder.
An error occurred while automatically activating bundle org.eclipse.m2e.core (547).
Error instantiating builder 'org.eclipse.m2e.core.maven2Builder'.
Plug-in org.eclipse.m2e.core was unable to load class org.eclipse.m2e.core.internal.builder.MavenBuilder.
An error occurred while automatically activating bundle org.eclipse.m23.core (547).
Plug-in org.eclipse.m2e.core was unable to load class org.eclipse.m2e.core.internal.builder.MavenBuilder.
an error occurred while automatically activating bundle org.eclipse.m2e.core (547).

if i delete the folder .metadata and all .project and .setting data from my workspace, i get no error. After one day of work i´ll get the same error.

Solution

Try next steps:

1. Go to your eclipse installation folder
2. Run "eclipse.exe -clean"
3. Work normally
4. Enjoy

Answered By - kingoleg