CRM 4.0: Microsoft Dynamics CRM has encountered an error

Hi,
I've this error in Dynamics and when I click on the "View the data that will be sent to Microsoft" I can see the following code:
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Microsoft Dynamics CRM Error Report Contents

<CrmScriptErrorReport>
  <ReportVersion>1.0</ReportVersion>
  <ScriptErrorDetails>
      <Message>Permission denied</Message>
      <Line>268</Line>
      <URL>/EUOSHAPARTNERS&#47;Tools&#47;SystemCustomization&#47;Entities&#47;manageEntity.aspx&#63;entityId&#61;&#123;20CFC568-D518-49A4-8E0C-9AEABAE3DEEB&#125;</URL>
      <PageURL>/EUOSHAPARTNERS&#47;Tools&#47;SystemCustomization&#47;Entities&#47;manageEntity.aspx&#63;entityId&#61;&#123;20CFC568-D518-49A4-8E0C-9AEABAE3DEEB&#125;</PageURL>
      <Function>loadPage&#40;sPageId&#41;</Function>
      <CallStack>
        <Function>loadPage&#40;sPageId&#41;</Function>
        <Function>function anonymous&#40;&#41;&#10;&#123;&#10;loadPage&#40;_oConst.sUIElementsPageId&#41;&#59;&#10;&#125;</Function>
        <Function>down&#40;o&#41;</Function>
        <Function>function anonymous&#40;&#41;&#10;&#123;&#10;down&#40;&#41;&#10;&#125;</Function>
      </CallStack>
  </ScriptErrorDetails>
  <ClientInformation>
      <BrowserUserAgent>Mozilla&#47;4.0 &#40;compatible&#59; MSIE 6.0&#59; Windows NT 5.1&#59; SV1&#59; .NET CLR 2.0.50727&#59; InfoPath.1&#41;</BrowserUserAgent>
      <BrowserLanguage>en-us</BrowserLanguage>
      <SystemLanguage>en-gb</SystemLanguage>
      <UserLanguage>es</UserLanguage>
      <ScreenResolution>1280x1024</ScreenResolution>
      <ClientName>Web</ClientName>
  </ClientInformation>
  <ServerInformation>
    <OrgLanguage>1033</OrgLanguage>
    <OrgCulture>1033</OrgCulture>
    <UserLanguage>1033</UserLanguage>
    <UserCulture>2057</UserCulture>
    <OrgID>&#123;CA746E59-9BA6-45EF-93D3-851096258A05&#125;</OrgID>
    <UserID>&#123;C6CF7858-5250-DE11-954E-000AE40DADFB&#125;</UserID>
    <CRMVersion>4.0.7333.3</CRMVersion>
  </ServerInformation>
</CrmScriptErrorReport>
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Any idea on how to solve this??  Thanks in advance

error.JPG