class not found on default configuration

[arcioneo]

I added your plugin with the basic configuration and I keep getting the following error:

[ERROR] Failed to execute goal com.alexnederlof:jasperreports-plugin:2.4:jasper (default) on project MonthEndReportsCore: Execution default of goal com.alexnederlof:jasperreports-plugin:2.4:jasper failed: A required class was missing while executing com.alexnederlof:jasperreports-plugin:2.4:jasper: org/codehaus/plexus/compiler/util/scan/mapping/SourceMapping
[ERROR] -----------------------------------------------------

By the way, the jar (plexus-api) with the required class and all other references are in my local repository(I checked one by one)