Generic SQL Error on create of contact in dynamics CRM2011

I am facing SQL Server Generic Error only when creating a new contact. I've unregistered all plugins and deactivated all workflows for the contact entity and also there is nothing at the on save event of the contact entity in MS Dynamics CRM. Even I've System Administrator rights. Also, I've restarted all async services and even IIS. But still I am facing SQL Server Generic error. Here in the following is the log file of the error.

and here in the following are the details of this problem:

Unhandled Exception: System.ServiceModel.FaultException`1[[Microsoft.Xrm.Sdk.OrganizationServiceFault, Microsoft.Xrm.Sdk, Version=5.0.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35]]: Generic SQL error.Detail: 
<OrganizationServiceFault xmlns:i="www.w3.org/.../XMLSchema-instance" xmlns="schemas.microsoft.com/.../Contracts">
  <ErrorCode>-2147204784</ErrorCode>
  <ErrorDetails xmlns:d2p1="schemas.datacontract.org/.../System.Collections.Generic" />
  <Message>Generic SQL error.</Message>
  <Timestamp>2015-10-21T08:35:59.5768434Z</Timestamp>
  <InnerFault i:nil="true" />
  <TraceText i:nil="true" />
</OrganizationServiceFault>

I've following details from tracing service.

    <CrmScriptErrorReport>
      <ReportVersion>1.0</ReportVersion>
      <ScriptErrorDetails>
       <Message>TypeError: errInfo is undefined</Message>
       <Line>153</Line>
       <URL>/_common/error/dlg_error.aspx?hresult=0x80044150</URL>
       <PageURL>/_common/error/dlg_error.aspx?hresult=0x80044150</PageURL>
       <Function>anonymousr:errInfoisundefined</Function>
       <CallStack>
        <Function>anonymousr:errInfoisundefined</Function>
       </CallStack>
      </ScriptErrorDetails>
      <ClientInformation>
       <BrowserUserAgent>Mozilla/5.0 (Windows NT 6.1; WOW64; rv:41.0) Gecko/20100101 Firefox/41.0</BrowserUserAgent>
       <BrowserLanguage>undefined</BrowserLanguage>
       <SystemLanguage>undefined</SystemLanguage>
       <UserLanguage>undefined</UserLanguage>
       <ScreenResolution>1600x900</ScreenResolution>
       <ClientName>Web</ClientName>
       <ClientTime>2015-10-21T15:00:18</ClientTime>
      </ClientInformation>
      <ServerInformation>
        <OrgLanguage>1033</OrgLanguage>
        <OrgCulture>1033</OrgCulture>
        <UserLanguage>1033</UserLanguage>
        <UserCulture>1033</UserCulture>
        <OrgID>{A7828227-4AF8-4F75-9183-19CD2FA04DE7}</OrgID>
        <UserID>{0A660BC8-F423-E511-8AA3-005056B04ACD}</UserID>
        <CRMVersion>5.0.9690.3448</CRMVersion>
      </ServerInformation>
    </CrmScriptErrorReport>