# Unable to capture objects : Web Driver Exception **URL:** \ **Category:** Mobile Testing\ **Tags:** mobile-testing, katalon-studio\ **Created:** [September 4, 2018, 1:42pm UTC](https://forum.katalon.com/t/unable-to-capture-objects-web-driver-exception/13018 "2018-09-04T13:42:56Z")\ **Posts on this page:** 1\ **Showing post:** 22
**Author:** ![Chris\_Trevarthen](https://dub1.discourse-cdn.com/katalon/user_avatar/forum.katalon.com/chris_trevarthen/32/358_2.png) [@Chris\_Trevarthen](https://forum.katalon.com/u/Chris_Trevarthen)\ **Post date:** [December 19, 2019, 2:47pm UTC](https://forum.katalon.com/t/unable-to-capture-objects-web-driver-exception/13018/22 "2019-12-19T14:47:06Z")
Hi @rajasingh.vimlax, Something you could look at for why the app isn’t starting is to set the `appWaitActivity` in your project: > [@'Unable to start application on this device' error. packageAndLaunchActivityFromManifest failed.](http://forum.katalon.com/t/unable-to-start-application-on-this-device-error-packageandlaunchactivityfrommanifest-failed/11781/5): > > Hi Rocky, There might be a mismatch between the package name and the activity name in your settings. There are some DesiredCapabilities you can set that might help you get around this. In your Project-\>Settings menu, go to Execution-\>Default-\>Mobile-\>Android. Add new entries for appPackage, appActivity, appWaitActivity, and appWaitDuration. Here’s a description of what those activities mean: [http://appium.io/docs/en/writing-running-appium/caps/](http://appium.io/docs/en/writing-running-appium/caps/) When done, it should look something like this (… As for not being able to capture the object due to the screenshot exception, this can occur when you are trying to capture a screen that is marked as “secure” - this can be on login screens to prevent capturing of username and passwords. See this post for more on that: > [@Unable to capture objects : Web Driver Exception](http://forum.katalon.com/t/unable-to-capture-objects-web-driver-exception/13018/4): > > Hi @mdmmzm, I’m currently using Katalon Studio 6.0.5 with Appium 1.8.2-beta (this is for iOS 12 support, so if you’re only testing Android, Appium 1.8.1 should work). When I try to use the Spy Mobile on a screen that is marked as secure, I get the error message below. Clicking the “Details” button shows that the screen is probably secure: If you click “OK”, the error dialog goes away. You won’t be able to see the preview of the screen in the Device View window, but you can still … Hope this helps, Chris --- _[View the full topic](https://forum.katalon.com/t/unable-to-capture-objects-web-driver-exception/13018)._