Testing my app on ios device leads to error:

See related comments in the thread: MOE 1.4.0 with Xcode 9 support is available for testing - #5 by Alan_Hamilton

If you don’t have Homebrew already installed, here are the steps to resolve this:

Edit: Just noticed you mentioned you don’t have admin access, it should be possible to install Homebrew as a non-admin user. This SuperUser answer suggests it is possible: macos - Can I install Homebrew without sudo privileges? - Super User