Error when accessing Contributions page

Server Error in '/' Application.

Error on load contribution: 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: U8.Exc.U8Exception: Error on load contribution: Object reference not set to an instance of an object.

Source Error: 


Line 172:            contribution.load(contributionId)
Line 173:        Catch ex As Exception
Line 174:            Throw New U8Exception("Error on load contribution: " + ex.Message)
Line 175:        Finally
Line 176:            mysql = Nothing

Source File: C:\Domains\smalltalking.net\SubDomains\u8\App_Code\U8Contribution.vb    Line: 174 

Stack Trace: 


[U8Exception: Error on load contribution: Object reference not set to an instance of an object.]
   U8Contribution.withContributionId(String contributionId) in C:\Domains\smalltalking.net\SubDomains\u8\App_Code\U8Contribution.vb:174
   contribution.loadContribution(String pContributionId) in C:\Domains\smalltalking.net\SubDomains\u8\contribution.aspx.vb:262
   contribution.Page_Load(Object sender, EventArgs e) in C:\Domains\smalltalking.net\SubDomains\u8\contribution.aspx.vb:33
   System.Web.UI.Control.OnLoad(EventArgs e) +99
   System.Web.UI.Control.LoadRecursive() +47
   System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint) +1436

Version Information: Microsoft .NET Framework Version:2.0.50727.1433; ASP.NET Version:2.0.50727.1433