c# - Linq GroupJoin exception -


i have similar query in code trying perform group join:

var query = client in _clientsrepository.query()             join order in _ordersrepository.query()             on client.id equals order.client.id orders             select new model(client, orders);

it's identical 101 linq samples, however, whenever run following exception:

{"unable cast object of type 'remotion.linq.clauses.groupjoinclause' type 'remotion.linq.clauses.fromclausebase'."}

not sure why happening , can't find answers on web.

here's stacktrace:

 @ nhibernate.linq.groupjoin.groupjoinaggregatedetectionvisitor.visitquerysourcereferenceexpression(querysourcereferenceexpression expression)    @ nhibernate.linq.visitors.nhexpressiontreevisitor.visitexpression(expression expression)    @ remotion.linq.parsing.expressiontreevisitor.visitandconvert[t](t expression, string methodname)    @ remotion.linq.parsing.expressiontreevisitor.visitlist[t](readonlycollection`1 list, func`2 visitmethod)    @ remotion.linq.parsing.expressiontreevisitor.visitnewexpression(newexpression expression)    @ nhibernate.linq.visitors.nhexpressiontreevisitor.visitexpression(expression expression)    @ nhibernate.linq.groupjoin.groupjoinaggregatedetectionvisitor.visit(ienumerable`1 groupjoinclause, expression selectexpression)    @ nhibernate.linq.groupjoin.aggregatinggroupjoinrewriter.rewrite(querymodel model)    @ nhibernate.linq.visitors.querymodelvisitor.generatehqlquery(querymodel querymodel, visitorparameters parameters, boolean root)    @ nhibernate.linq.nhlinqexpression.translate(isessionfactoryimplementor sessionfactory)    @ nhibernate.hql.ast.antlr.astquerytranslatorfactory.createquerytranslators(string queryidentifier, iqueryexpression queryexpression, string collectionrole, boolean shallow, idictionary`2 filters, isessionfactoryimplementor factory)    @ nhibernate.engine.query.hqlexpressionqueryplan.createtranslators(string expressionstr, iqueryexpression queryexpression, string collectionrole, boolean shallow, idictionary`2 enabledfilters, isessionfactoryimplementor factory)    @ nhibernate.engine.query.queryplancache.gethqlqueryplan(iqueryexpression queryexpression, boolean shallow, idictionary`2 enabledfilters)    @ nhibernate.impl.abstractsessionimpl.gethqlqueryplan(iqueryexpression queryexpression, boolean shallow)    @ nhibernate.impl.abstractsessionimpl.createquery(iqueryexpression queryexpression)    @ nhibernate.linq.defaultqueryprovider.execute(expression expression)    @ nhibernate.linq.defaultqueryprovider.execute[tresult](expression expression)    @ remotion.linq.queryablebase`1.getenumerator()    @ system.linq.systemcore_enumerabledebugview`1.get_items()

any ideas?


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