Open a db file causes an error

We get the following error, if we open a db file.

We use ObjectDB 2.6.8.

What is wrong?

Caused by: java.lang.NullPointerException: null
at com.objectdb.o.IXN.<init>(IXN.java:136) ~[na:na]
at com.objectdb.o.UTY.Z(UTY.java:703) ~[na:na]
at com.objectdb.o.TYS.l(TYS.java:176) ~[na:na]
at com.objectdb.o.TYM.ae(TYM.java:529) ~[na:na]
at com.objectdb.o.TYM.<init>(TYM.java:194) ~[na:na]
at com.objectdb.o.OMF.ap(OMF.java:840) ~[na:na]
at com.objectdb.o.OMF.ao(OMF.java:792) ~[na:na]
at com.objectdb.jpa.EMF.ao(EMF.java:238) ~[na:na]
at com.objectdb.o.OMF.an(OMF.java:690) ~[na:na]
at com.objectdb.jpa.EMF.createEntityManager(EMF.java:257) ~[na:na]

The stack trace indicates an unexpected type during initialization.

Could you please provide more details about when this error started? Maybe after some schema change, such as changing a non entity class to an entity class?

Please try build 2.8.0_01.

Thanks, the fix works.