Good morning eliel_raphael!
Thanks for reaching out about the issue you're having with opening an app since updating to macOS Mojave. I'll be happy to shed some light on this.
Take a look here for some information about issues related to opening apps after updating:
If an app won't run or install on your Mac after you upgrade macOS
If an app doesn't work after you upgrade your Mac operating system, check for updates.
If an app isn't working as you expect
After you upgrade macOS, you might find that some third-party apps don't work or act as you expect. An app might not open, run, or install, even if you try to reinstall it.
You might see this issue if:
Make sure that you have the latest version
If an app doesn’t work after you upgrade, make sure that you have the latest version:
-
Check for an updated version of the app that is compatible with your new OS. Apps in the Mac App Store list their compatibility and system requirements on their product pages.
-
Find out whether the app developer has a new version or plans to release a new version of the app that is compatible with your new OS.
If an app won't run or install on your Mac after you upgrade macOS - Apple Support
Hope that helps! Take care.