# Error UiPath.Excel.WorkbookApplication **URL:** \ **Category:** Help\ **Tags:** studio, excel, activities\ **Created:** [September 6, 2019, 11:01pm UTC](https://forum.uipath.com/t/error-uipath-excel-workbookapplication/148734 "2019-09-06T23:01:55Z")\ **Posts on this page:** 5\ **Page:** 1
**Author:** ![Sergio\_Dennis\_Aguila](https://sea2.discourse-cdn.com/uipath/user_avatar/forum.uipath.com/sergio_dennis_aguila/32/93737_2.png) [@Sergio\_Dennis\_Aguila](https://forum.uipath.com/u/Sergio_Dennis_Aguila)\ **Post date:** [September 6, 2019, 11:01pm UTC](https://forum.uipath.com/t/error-uipath-excel-workbookapplication/148734/1 "2019-09-06T23:01:55Z")
error UiPath.Excel.WorkbookApplication, When I try to publish: #### Screenshot: ![image](https://global.discourse-cdn.com/uipath/original/3X/4/f/4fee7283fa9fbc1dfa4ca153288375b59120830f.png) please your support since here [Interop.Excel.Application is not defined](https://forum.uipath.com/t/interop-excel-application-is-not-defined/16716) They have not given a solution. ---
**Author:** ![Natapong](https://sea2.discourse-cdn.com/uipath/user_avatar/forum.uipath.com/natapong/32/123807_2.png) [@Natapong](https://forum.uipath.com/u/Natapong)\ **Post date:** [September 7, 2019, 12:57am UTC](https://forum.uipath.com/t/error-uipath-excel-workbookapplication/148734/2 "2019-09-07T00:57:22Z")
Hi, @Sergio_Dennis_Aguila Could you please try to import Microsoft.Office.Core ![image](https://global.discourse-cdn.com/uipath/original/3X/0/7/0723e6fd40b5c00ef68f2041dc28fd671839ee25.png) You can refer at below > [@Validation Error (System.Xaml.Serialization) (UiPath.Excel.WorkbookApplication)](https://forum.uipath.com/t/validation-error-system-xaml-serialization-uipath-excel-workbookapplication/148212): > > Hello guys, could someone help me with the following validation errors? P.S the bot works perfectly only when I click the Validation Button these pops up and I would like to eliminate them in order to publish the Bot, I would really appreciate your help I hope it would be useful for you ---
**Author:** ![indra](https://sea2.discourse-cdn.com/uipath/user_avatar/forum.uipath.com/indra/32/34761_2.png) [@indra](https://forum.uipath.com/u/indra)\ **Post date:** [September 7, 2019, 3:58am UTC](https://forum.uipath.com/t/error-uipath-excel-workbookapplication/148734/3 "2019-09-07T03:58:36Z")
@Sergio_Dennis_Aguila Create Workbook variable in **Excel Application Scope** ---
**Author:** ![Lahiru.Fernando](https://sea2.discourse-cdn.com/uipath/user_avatar/forum.uipath.com/lahiru.fernando/32/523857_2.png) [@Lahiru.Fernando](https://forum.uipath.com/u/Lahiru.Fernando)\ **Post date:** [September 7, 2019, 4:04am UTC](https://forum.uipath.com/t/error-uipath-excel-workbookapplication/148734/4 "2019-09-07T04:04:13Z")
Hi @Sergio_Dennis_Aguila Please refer to this post > [@How to Solve The Recent Validation Error In Excel Application Scope](https://forum.uipath.com/t/how-to-solve-the-recent-validation-error-in-excel-application-scope/146919): > > Hello Guys, Problem Statement With the latest update of the UiPath studio, there are concerns around the Excel Application Scope as it throws out validation errors. Many are complaining about this error “Excel Workbook Application is not defined”, and I have personally come across this in my automation solutions. You could easily locate this error by simply clicking on the Validate button on the top ribbon. If you have excel application scope, most probably you’ll see this error. It doesn’t sh… ---
**Author:** ![system](https://sea2.discourse-cdn.com/uipath/user_avatar/forum.uipath.com/system/32/182466_2.png) [@system](https://forum.uipath.com/u/system)\ **Post date:** [September 10, 2019, 4:04am UTC](https://forum.uipath.com/t/error-uipath-excel-workbookapplication/148734/5 "2019-09-10T04:04:15Z")
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