c# - Entityframework.extensions error "Sequence contains more than one element" on batch delete -

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i using entityframework.extended library in project, contains code first entity model. receiving error message "sequence contains more 1 element" when execute linq statement , perform batch delete library: 

var subjlocal = (from subjectlocal in customercontext.rostersummarydata_subject_local                          ((subjectlocal.fkrostersetid == 0) &&                                 (statsinfo.testinstanceidslist.contains(subjectlocal.fktestinstanceid)) &&                                 (subjectlocal.fktesttypeid == statsinfo.testtypeid) &&                                 (statsinfo.schoolyearidslist.contains(subjectlocal.fkschoolyearid)) &&                                 (subjectlocal.fkrostertypeid == 1) &&                                 (subjectlocal.fkschoolid == 0) &&                                 (subjectlocal.fkdepartmentid == 1) &&                                 (subjectlocal.fkcourseid == 1) &&                                 (subjectlocal.fkperiodid == 1) &&                                 (statsinfo.democatidslist.contains(subjectlocal.fkdemocommoncategoryid)) &&                                 (statsinfo.democodeidslist.contains(subjectlocal.fkdemocommoncodeid)) &&                                 (statsinfo.testsubjectidslist.contains(subjectlocal.fktest_subjectid)))                          select subjectlocal.pksummarysubjectlocalid).toarray();          if (subjlocal.length > 0)         {             customercontext.rostersummarydata_subject_local.where(s => subjlocal.contains(s.pksummarysubjectlocalid)).delete();             customercontext.rostersummarydata_subject_local_bands.where(s => subjlocal.contains(s.fksummarysubjectlocalid)).delete();             customercontext.rostersummarydata_subject_local_averages.where(s => subjlocal.contains(s.fksummarysubjectlocalid)).delete();              customercontext.savechanges();         }

the error occurs at:

customercontext.rostersummarydata_subject_local.where(s => subjlocal.contains(s.pksummarysubjectlocalid)).delete();

customercontext base entity inheriting dbcontext , rostersummarydata_subject_local / _bands / _averages child tables. importing library using reference , notices delete() method works properly:

using entityframework.extensions;

isn't purpose of batch delete make sure can delete multiple items @ once , shouldn't sequence contain more 1 element? there missing here?

you can find similar post entityframework.extensions 6.1 batch delete throws "sequence contains more 1 element" here.

according @deherech seems bug in extension framework


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