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I have created a site template named poMail.wsp and when I try to add it to the catalog via "upload solution" I get this error :

Server Error in '/' Application.

Object reference not set to an instance of an object. 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.NullReferenceException: Object reference not set to an instance of an object.

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:

[NullReferenceException: Object reference not set to an instance of an object.]
Microsoft.SharePoint.ApplicationPages.UploadPage.OnSubmitSolution(SPLongOperation longOperation, SPFile file) +40
Microsoft.SharePoint.ApplicationPages.UploadPage.OnSubmit(Object o, EventArgs e) +685
System.Web.UI.HtmlControls.HtmlInputButton.OnServerClick(EventArgs e) +114 System.Web.UI.Page.RaisePostBackEvent(IPostBackEventHandler sourceControl, String eventArgument) +28
System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint) +2980

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i found the answer

i ran Timer Service Recycle job (found this on a forum) and then tried uploading with another acount that has full control over the site collection, and it worked like a charm. i hope it helps someone ;)

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