Error while loading Referencemetadata module

i have been previously compliling the referencemetadata module and loading itsuccessfuly, but i cant understand why it now throws this error here, after pulling the latest changes from the openmrs master. am running Ref application 2.8. am currently working on https://issues.openmrs.org/browse/RA-429 cc @dkayiwa @samuel34 @wyclif @tendomart

Could this error be due to your local changes?

hi @samuel34, at first i thought it was due to my local changes , though innitially there was no problem . but i decided to clone again the module afresh , compiled it , and tried to run it without any of my changesnand still threw that error