Eclipse - Editor error

Error:
Cannot F3 to the source reference

Problems occurred when invoking code from plug-in: “org.eclipse.jface” when using Checkstyle Plugin ...

Solve:
Restore all installed plugin of eclipse

1. Try so start Eclipse from the console/terminal with the -clean option.
On Windows:

Eclipse.exe -clean

On *nix:

./eclipse -clean

or if Eclipse is in your PATH

eclipse -clean

2. Back to the Advanced Content Assist preference page and Restore Defaults.  Close the dialog using the OK button.