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Server Error in '/' Application. Value cannot be null. Parameter name: fieldNameTranslator Description: An unhandled exception occurred during the execution of the current web request. Please review the stack trace for more information about the error and where it originated in the code. Exception Details: System.ArgumentNullException: Value cannot be null. Parameter name: fieldNameTranslator Source Error: An unhandled exception was generated during the execution of the current web request. Information regarding the origin and location of the exception can be identified using the exception stack trace below. Stack Trace: [ArgumentNullException: Value cannot be null. Parameter name: fieldNameTranslator]    Sitecore.ContentSearch.Linq.Solr.SolrIndexParameters..ctor(IIndexValueFormatter valueFormatter, IFieldQueryTranslatorMap`1 fieldQueryTranslators, FieldNameTranslator fieldNameTranslator, IExecutionContext[] execu...

If you are working with Solr provider for Sitecore 8, I'm sure you have already read this  article regarding changes to the Schema.xml that must be applied. In a recent Solr integration with Sitecore 8 Update 5  (rev. 150812) , I ran into the following error(s): Connection error to search provider [Solr] : Unable to connect to <solr service address>, Core: [index_name] Description: An unhandled exception occurred during the execution of the current web request. Please review the stack trace for more information about the error and where it originated in the code. Exception Details: Sitecore.ContentSearch.Exceptions.SearchProviderConnectionException: Connection error to search provider [Solr] : Unable to connect to [http://ocomp-sc-solr:8080/solr], Core: [social_messages_master] Source Error: An unhandled exception was generated during the execution of the current web request. Information regarding the origin and location of the exception can ...