asp.net developer needed to fix few errors

Project Description:
hey i have some kind of weird error that showed up on my site

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Offending URL: http://luckylaced.com/MasterPages/MyAccount.aspx
Source: System.Web
Message: Exception of type 'System.Web.HttpUnhandledException' was thrown.
Stack trace: at System.Web.UI.Page.HandleError(Exception e) at System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint) at System.Web.UI.Page.ProcessRequest(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint) at System.Web.UI.Page.ProcessRequest() at System.Web.UI.Page.ProcessRequestWithNoAssert(HttpContext context) at System.Web.UI.Page.ProcessRequest(HttpContext context) at ASP.masterpages_myaccount_aspx.ProcessRequest(HttpContext context) at System.Web.HttpApplication.CallHandlerExecutionStep.System.Web.HttpApplication.IExecutionStep.Execute() at System.Web.HttpApplication.ExecuteStep(IExecutionStep step, Boolean& completedSynchronously)
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what i need is

1- fix this error
2- make the news letter work right on the site
3- edit shipment price