the application has unexpectedly quit getting error when trying to uninstall colfusion 2018

Anita, we could really benefit from having more to go on, about your situation. 

• What OS are you on, and what version?
• How are you doing the uninstaller, specifically?
• Are you (the user you're logged in as) the same user who installed cf?
• Is cf able to run? I realize you want to uninstall it, but it could help as  confirmation of some things
• Along those lines, had you or someone perhaps uninstalled the java that cf may be pointing to? And what version is that? And what version of java (if any) is reported, if you go to the command line and run "java - version"?

There can be any number of explanations for an error like that, so I hope these may start to get you to a solution, if no one else offers one sooner.