Error occured in the application

Message :

The connection name 'TVET_SMISConnectionString' was not found in the applications configuration or the connection string is empty.

http://hpc.gov.af/ShowError.aspx?aspxerrorpath=/Reports/ProvinceProfile/ProvProfileE.aspx
System.Web

at System.Web.Compilation.ConnectionStringsExpressionBuilder.GetConnectionString(String connectionStringName) at ASP.reports_provinceprofile_provprofilee_aspx.__BuildControlSqlDataSource1() in e:\tvet3\Reports\ProvinceProfile\ProvProfileE.aspx:line 143 at ASP.reports_provinceprofile_provprofilee_aspx.__BuildControl__control7(Control __ctrl) in e:\tvet3\Reports\ProvinceProfile\ProvProfileE.aspx:line 58 at System.Web.UI.UpdatePanel.CreateContents() at System.Web.UI.UpdatePanel.set_ContentTemplate(ITemplate value) at ASP.reports_provinceprofile_provprofilee_aspx.__BuildControlUpdatePanel1() in e:\tvet3\Reports\ProvinceProfile\ProvProfileE.aspx:line 58 at ASP.reports_provinceprofile_provprofilee_aspx.__BuildControlContent2(Control __ctrl) in e:\tvet3\Reports\ProvinceProfile\ProvProfileE.aspx:line 15 at System.Web.UI.MasterPage.InstantiateInContentPlaceHolder(Control contentPlaceHolder, ITemplate template) at ASP.masterpage_report_master.__BuildControlContentPlaceHolder1() in e:\tvet3\MasterPage\Report.master:line 79 at ASP.masterpage_report_master.__BuildControlform1() in e:\tvet3\MasterPage\Report.master:line 28 at ASP.masterpage_report_master.__BuildControlTree(masterpage_report_master __ctrl) in e:\tvet3\MasterPage\Report.master:line 1 at ASP.masterpage_report_master.FrameworkInitialize() in c:\Windows\Microsoft.NET\Framework64\v4.0.30319\Temporary ASP.NET Files\root\8522e621\97d3694c\App_Web_uiplezw3.2.cs:line 0 at System.Web.UI.MasterPage.CreateMaster(TemplateControl owner, HttpContext context, VirtualPath masterPageFile, IDictionary contentTemplateCollection) at System.Web.UI.Page.get_Master() at System.Web.UI.Page.ApplyMasterPage() at System.Web.UI.Page.PerformPreInit() at System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint)

System.InvalidOperationException: The connection name 'TVET_SMISConnectionString' was not found in the applications configuration or the connection string is empty. at System.Web.Compilation.ConnectionStringsExpressionBuilder.GetConnectionString(String connectionStringName) at ASP.reports_provinceprofile_provprofilee_aspx.__BuildControlSqlDataSource1() in e:\tvet3\Reports\ProvinceProfile\ProvProfileE.aspx:line 143 at ASP.reports_provinceprofile_provprofilee_aspx.__BuildControl__control7(Control __ctrl) in e:\tvet3\Reports\ProvinceProfile\ProvProfileE.aspx:line 58 at System.Web.UI.UpdatePanel.CreateContents() at System.Web.UI.UpdatePanel.set_ContentTemplate(ITemplate value) at ASP.reports_provinceprofile_provprofilee_aspx.__BuildControlUpdatePanel1() in e:\tvet3\Reports\ProvinceProfile\ProvProfileE.aspx:line 58 at ASP.reports_provinceprofile_provprofilee_aspx.__BuildControlContent2(Control __ctrl) in e:\tvet3\Reports\ProvinceProfile\ProvProfileE.aspx:line 15 at System.Web.UI.MasterPage.InstantiateInContentPlaceHolder(Control contentPlaceHolder, ITemplate template) at ASP.masterpage_report_master.__BuildControlContentPlaceHolder1() in e:\tvet3\MasterPage\Report.master:line 79 at ASP.masterpage_report_master.__BuildControlform1() in e:\tvet3\MasterPage\Report.master:line 28 at ASP.masterpage_report_master.__BuildControlTree(masterpage_report_master __ctrl) in e:\tvet3\MasterPage\Report.master:line 1 at ASP.masterpage_report_master.FrameworkInitialize() in c:\Windows\Microsoft.NET\Framework64\v4.0.30319\Temporary ASP.NET Files\root\8522e621\97d3694c\App_Web_uiplezw3.2.cs:line 0 at System.Web.UI.MasterPage.CreateMaster(TemplateControl owner, HttpContext context, VirtualPath masterPageFile, IDictionary contentTemplateCollection) at System.Web.UI.Page.get_Master() at System.Web.UI.Page.ApplyMasterPage() at System.Web.UI.Page.PerformPreInit() at System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint)