iam using PowerView for multiDimensional (sql server 2012 enterprise and sharePoint 2013 enterprise),i have installed sql sp1 cummulative update #4
i created a connection to the cube and it was created successfully, but when trying to create new PowerView, it gives me this error
An error occurred while loading the model for the item or data source 'http://bi-practice-ms/sites/PowerView11/Data Connections/EchannelCube.rsds'. Verify that the connection information is correct and that you have permissions to access the data source.
the error details
<detail><ErrorCode xmlns="http://www.microsoft.com/sql/reportingservices">rsCannotRetrieveModel</ErrorCode><HttpStatus xmlns="http://www.microsoft.com/sql/reportingservices">400</HttpStatus><Message xmlns="http://www.microsoft.com/sql/reportingservices">An error occurred while loading the model for the item or data source 'http://bi-practice-ms/sites/PowerView11/Data Connections/EchannelCube.rsds'. Verify that the connection information is correct and that you have permissions to access the data source.</Message><HelpLink xmlns="http://www.microsoft.com/sql/reportingservices">http://go.microsoft.com/fwlink/?LinkId=20476&EvtSrc=Microsoft.ReportingServices.Diagnostics.Utilities.ErrorStrings&EvtID=rsCannotRetrieveModel&ProdName=Microsoft%20SQL%20Server%20Reporting%20Services&ProdVer=11.0.3368.0</HelpLink><ProductName xmlns="http://www.microsoft.com/sql/reportingservices">Microsoft SQL Server Reporting Services</ProductName><ProductVersion xmlns="http://www.microsoft.com/sql/reportingservices">11.0.3368.0</ProductVersion><ProductLocaleId xmlns="http://www.microsoft.com/sql/reportingservices">127</ProductLocaleId><OperatingSystem xmlns="http://www.microsoft.com/sql/reportingservices">OsIndependent</OperatingSystem><CountryLocaleId xmlns="http://www.microsoft.com/sql/reportingservices">1033</CountryLocaleId><MoreInformation xmlns="http://www.microsoft.com/sql/reportingservices"><Source>ReportingServicesLibrary</Source><Message msrs:ErrorCode="rsCannotRetrieveModel" msrs:HelpLink="http://go.microsoft.com/fwlink/?LinkId=20476&EvtSrc=Microsoft.ReportingServices.Diagnostics.Utilities.ErrorStrings&EvtID=rsCannotRetrieveModel&ProdName=Microsoft%20SQL%20Server%20Reporting%20Services&ProdVer=11.0.3368.0" xmlns:msrs="http://www.microsoft.com/sql/reportingservices">An error occurred while loading the model for the item or data source 'http://bi-practice-ms/sites/PowerView11/Data Connections/EchannelCube.rsds'. Verify that the connection information is correct and that you have permissions to access the data source.</Message><MoreInformation><Source>Microsoft SQL Server 2012 Analysis Services</Source><Message>Errors in the metadata manager. Discover CSDL is not allowed on a server working in OLAP mode.</Message></MoreInformation></MoreInformation><Warnings xmlns="http://www.microsoft.com/sql/reportingservices" /></detail>
alnaggar