convert email to case error CRM 4.0

Hi

I have a problem where my workflow to convert an email to a case is not working.  I am wondering if the problem is because i receive the following error when i manually convert an email that has come into my queue....

Microsoft Dynamics CRM Error Report Contents

<CrmScriptErrorReport>
  <ReportVersion>1.0</ReportVersion>
  <ScriptErrorDetails>
 <Message>Expected &#39;&#59;&#39;</Message>
 <Line>15</Line>
 <URL>/EquinitiICS&#47;_forms&#47;FormScript.js.aspx&#63;etc&#61;4202&#38;FormType&#61;main&#38;FormName&#61;crmForm</URL>
 <PageURL>/EquinitiICS&#47;activities&#47;email&#47;edit.aspx&#63;id&#61;&#123;AD145BA2-5CD7-E211-9039-00155D001413&#125;</PageURL>
 <Function></Function>
 <CallStack>
 </CallStack>
  </ScriptErrorDetails>
  <ClientInformation>
 <BrowserUserAgent>Mozilla&#47;4.0 &#40;compatible&#59; MSIE 7.0&#59; Windows NT 6.1&#59; Trident&#47;5.0&#59; SLCC2&#59; .NET CLR 2.0.50727&#59; .NET CLR 3.5.30729&#59; .NET CLR 3.0.30729&#59; Media Center PC 6.0&#59; InfoPath.3&#59; .NET4.0C&#59; .NET4.0E&#41;</BrowserUserAgent>
 <BrowserLanguage>en-us</BrowserLanguage>
 <SystemLanguage>en-gb</SystemLanguage>
 <UserLanguage>en-gb</UserLanguage>
 <ScreenResolution>1680x1050</ScreenResolution>
 <ClientName>Web</ClientName>
  </ClientInformation>
  <ServerInformation>
    <OrgLanguage>1033</OrgLanguage>
    <OrgCulture>2057</OrgCulture>
    <UserLanguage>1033</UserLanguage>
    <UserCulture>2057</UserCulture>
    <OrgID>&#123;9E043D8C-675F-DF11-BCFD-001A4BCDEB20&#125;</OrgID>
    <UserID>&#123;C110D897-675F-DF11-BCFD-001A4BCDEB20&#125;</UserID>
    <CRMVersion>4.0.7333.3732</CRMVersion>
  </ServerInformation>
</CrmScriptErrorReport>

Does anyone know what this error means?

Thank you,

Janette