UPDATE - Try barryrowe's answer below before resorting to recreating a brand new project. It's a simple, easy to follow solution that appears to work well. Thanks Barry!
I've come across a similar error several times after removing plugins and reinstalling them. The only solution that has ever worked for me is to start afresh with a brand new app project, then copy back in the files from my 'www' folder and redo any necessary changes in Xcode.
Looking at https://issues.apache.org/jira/browse/CB-4971 it seems like this is a bug that the Cordova team is trying to track down. That link has some alternative suggestions, but starting afresh is still probably easier, unless your app has a lot of custom Xcode changes that would need to be re-done.
I'm not that familiar with Handlebars, but your code looks to have an extra comma and space after {{this.url}}
. But I think your main problem is related to the plugin itself, not the code.
By the way, if you've installed the InAppBrowser plugin correctly using the command line, you won't need to manually alter the config.xml file, as the necessary plugin code will automatically be added to the config.xml files of the relevant platforms when you next build your project.