asp.net mvc - MVC Model Error on TryUpdateModel() -

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i have error (see below). @ first glance seems obvious me, however. i've checked everything: model ok; metadata class set ok , i've checked controller , @ time 'tryupdatemodel' called , object expect be. i'm thinking silly been stuck day, recommend anything?

the associated metadata type type 'lms.model.paymentfrequency' contains following unknown properties or fields: siteagreementid, paymenttypeid, paymentcategoryid, obligationstartdate, terminationdate, comments. please make sure names of these members match names of properties on main type.

description: unhandled exception occurred during execution of current web request. please review stack trace more information error , originated in code.

exception details: system.invalidoperationexception: associated metadata type type 'lms.model.paymentfrequency' contains following unknown properties or fields: siteagreementid, paymenttypeid, paymentcategoryid, obligationstartdate, terminationdate, comments. please make sure names of these members match names of properties on main type.

source error: 

line 120:            paymentfrequency paymentfrequency = this._siterepository.getpayment(convert.toint16(collection["paymentid"])).paymentfrequency; line 121: line 122:            tryupdatemodel(paymentfrequency); line 123: line 124:            if (!modelstate.isvalid)

it sounds metadata class have attached paymentfrequency model may have properties model doesn't.


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