Makumba invalid value error

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While executing page http://www.best.eu.org/student/career/viewOffer.jsp

invalid external pointer for type best.minerva.TrackableLink : 74bnov

org.makumba.InvalidValueException: invalid external pointer for type best.minerva.TrackableLink : 74bnov
	at org.makumba.Pointer.<init>(Pointer.java:158)
	at org.eu.best.website.student.CareerViewOfferLogic.checkAttributes(Unknown Source)
	


Makumba developer support; version:0.9.7-SNAPSHOT - 2019-03-24_1632_35 dataSource:production host:localhost path:/var/lib/tomcat7