c# - Can't solve Could not load type 'System.Data.Entity.Design.AspNet.EntityDesignerBuildProvider' -

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i have web asp.net site working fine wcf services. now, have class library telerik reports needs call these same web services. keep getting error not load type 'system.data.entity.design.aspnet.entitydesignerbuildprovider'. when try add service reference web service. have searched topic , done people pointed out. in project implement web services , site, config has:

compilation debug="true" targetframework="4.5">         <assemblies>           <add assembly="system.design, version=4.0.0.0, culture=neutral, publickeytoken=b03f5f7f11d50a3a" />           <add assembly="system.windows.forms, version=4.0.0.0, culture=neutral, publickeytoken=b77a5c561934e089" />           <add assembly="system.speech, version=4.0.0.0, culture=neutral, publickeytoken=31bf3856ad364e35" />           <add assembly="system.data.entity.design, version=4.0.0.0, culture=neutral, publickeytoken=b77a5c561934e089" />            <add assembly="telerik.reportviewer.webforms, version=8.0.14.225, culture=neutral, publickeytoken=a9d7983dfcc261be" />           <add assembly="telerik.reporting, version=8.0.14.225, culture=neutral, publickeytoken=a9d7983dfcc261be" />         </assemblies>         <buildproviders>           <add extension=".edmx" type="system.data.entity.design.aspnet.entitydesignerbuildprovider" />         </buildproviders>

and in class library config:

<compilation debug="true" targetframework="4.5">     <assemblies>       <add assembly="system.design, version=4.0.0.0, culture=neutral, publickeytoken=b03f5f7f11d50a3a" />       <add assembly="system.data.entity, version=4.0.0.0, culture=neutral, publickeytoken=b77a5c561934e089" />       <add assembly="system.data.entity.design, version=4.0.0.0, culture=neutral, publickeytoken=b77a5c561934e089" />     </assemblies>     <buildproviders>       <add extension=".edmx" type="system.data.entity.design.aspnet.entitydesignerbuildprovider" />     </buildproviders>

all of answers i've read add following still not work:

<add assembly="system.data.entity.design, version=4.0.0.0, culture=neutral, publickeytoken=b77a5c561934e089" />

i had same error in visual studio 2015....

could not load type system.data.entity.design.aspnet.entitydesignerbuildprovider

i solve problem adding line: 

<assemblies> ....  <add assembly="system.data.entity.design, version=4.0.0.0, culture=neutral, publickeytoken=b77a5c561934e089" /> ....     </assemblies>

in main web.config file , problem disappeared.


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