Microsoft Error in Dialog

Hello,

I created a Dialog in CRM 2011. Everyone in the company starting using it, no errors occurred. Last week one of the user ran the dialog and when the person hit the finish button, an error shows up. This is the detail of the error. I don't understand it. Please need help. Thank you!

<CrmScriptErrorReport>

  <ReportVersion>1.0</ReportVersion>

  <ScriptErrorDetails>

   <Message>Error initializing component with element id='webResources_lookup' and with type='null': Object doesn't support this action</Message>

   <Line>0</Line>

   <URL>/cs/dialog/rundialog.aspx?DialogId=%7bAF123825-9ED1-476A-B3CB-4798DFC7F4FC%7d&EntityName=email&ObjectId=%7b3534FE05-7AA7-E711-9D39-0050568019E4%7d</URL>

   <PageURL>/cs/dialog/rundialog.aspx?DialogId=%7bAF123825-9ED1-476A-B3CB-4798DFC7F4FC%7d&EntityName=email&ObjectId=%7b3534FE05-7AA7-E711-9D39-0050568019E4%7d</PageURL>

   <Function>anonymous(type,properties,events,references,element){try{if(!Mscrm.PageManager.$1d)return$create(type,properties,events,references,element)}catch($v_0){if(!element)returnnull;var$v_1=String.format("Errorinitializingcomponentwithelementid='{0}'andwithtype=</Function>

   <CallStack>

    <Function>anonymous(type,properties,events,references,element){try{if(!Mscrm.PageManager.$1d)return$create(type,properties,events,references,element)}catch($v_0){if(!element)returnnull;var$v_1=String.format("Errorinitializingcomponentwithelementid='{0}'andwithtype='{1}':{2}",!element?"null":element.id,!type?"null":type.getName(),$v_0.message);catchError($v_1,window.location.href,0,true)}returnnull}</Function>

    <Function>crmApplicationInitHandler()</Function>

    <Function>anonymous(c,d){for(varb=0,e=a.length;b<e;b++)a[b](c,d)}</Function>

    <Function>anonymous(){vara=this.get_events().getHandler("init");if(a){this.beginCreateComponents();a(this,Sys.EventArgs.Empty);this.endCreateComponents()}}</Function>

    <Function>anonymous(){if(!this.get_isInitialized()&&!this._disposing){Sys._Application.callBaseMethod(this,"initialize");this._raiseInit();if(this.get_stateString){if(Sys.WebForms&&Sys.WebForms.PageRequestManager){this._beginRequestHandler=Function.createDelegate(this,this._onPageRequestManagerBeginRequest);Sys.WebForms.PageRequestManager.getInstance().add_beginRequest(this._beginRequestHandler);this._endRequestHandler=Function.createDelegate(this,this._onPageRequestManagerEndRequest);Sys.WebForms.PageRequestManager.getInstance().add_endRequest(this._endRequestHandler)}vara=this.get_stateString();if(a!==this._currentEntry)this._navigate(a);elsethis._ensureHistory()}this.raiseLoad()}}</Function>

    <Function>b()</Function>

    <Function>anonymous(){document.removeEventListener("DOMContentLoaded",a,false);b()}</Function>

   </CallStack>

  </ScriptErrorDetails>

  <ClientInformation>

   <BrowserUserAgent>Mozilla/5.0 (compatible; MSIE 10.0; Windows NT 6.1; Trident/7.0; SLCC2; .NET CLR 2.0.50727; Media Center PC 6.0; .NET CLR 1.1.4322; .NET CLR 3.5.30729; .NET CLR 3.0.30729)</BrowserUserAgent>

   <BrowserLanguage>en-US</BrowserLanguage>

   <SystemLanguage>en-US</SystemLanguage>

   <UserLanguage>en-US</UserLanguage>

   <ScreenResolution>2133x1200</ScreenResolution>

   <ClientName>Web</ClientName>

   <ClientTime>2017-10-02T10:36:40</ClientTime>

  </ClientInformation>

  <ServerInformation>

    <OrgLanguage>1033</OrgLanguage>

    <OrgCulture>1033</OrgCulture>

    <UserLanguage>1033</UserLanguage>

    <UserCulture>1033</UserCulture>

    <OrgID>{BB528058-2FA1-E211-9803-00155D014140}</OrgID>

    <UserID>{65FBBFCB-9582-E711-ABB1-0050568019E4}</UserID>

    <CRMVersion>5.0.9690.4376</CRMVersion>

  </ServerInformation>

</CrmScriptErrorReport>