I think yours could be a problem with your hosting server.
It could be that your hosting provider doesn’t allow the use of the php function file_get_contents().
You could contact your provider and ask if it’s enabled. Some people managed to make it work asking if file_get_contents() was allowed and if there were the following parameters in the server php configuration:
check another page/app on my site to see that its working fine. Move the cursor to google play banner were download link is to se how its add <u> tag to app after com.tractorsetgo. like this com.tractorsetgo.<u>gelluloid</u>
It seems like you have entered the com.tractorsetgo.gelluloid and accidentally underlined the word gelluloid in the wordpress editor. Please check this, I’m sure if you go in “text” view of the wordpress editor you will find [app]com.tractorsetgo.<u>gelluloid</u>[/app]