Fatal error: in boostrap.inc line number 2913
modules/user/views_handler_field_user_name.inc is one of the Views files.
Delete the /home/myapp/myapp.com/sites/all/modules/views directory (and the files it contains), and copy the Views files from the archive file you download from the project page. Just be sure to download the same version you installed before, and to copy the files in the same directory they were before. (The views.module file must be in /home/myapp/myapp.com/sites/all/modules/views/views.module, not /home/myapp/myapp.com/sites/all/modules/views/views/views.module, or /home/myapp/myapp.com/sites/all/modules/views.module.)