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I think you can do it one of two ways. The first way is to click on the the "Applications" tab, then click on the application with the error you want to ignore. Once you're on the Application Dashboard, you can then click on "Configuration" on the side menu, then "Instrumentation." From there, click on "Error Detetection" and then click on the sub-tab for the language your BT is written in (i.e. java, .Net, php, etc.), and add the BTs to the appropriate "ignore" box (i.e. exception, message, catagories)
The other way is to edit the app-agent-config.xml file in the <agent_home>/<version_number>/conf/app-agent-config.xml folder on your server and edit it out from there so it doesn't even report to the Controller. To do that you can follow this documentation: https://docs.appdynamics.com/display/PRO45/Filter+Sensitive+Data
Taking what you gave me and munging it with some other work I did with detecting some loadrunner headers...
Example to excllude BTs named /my/example
Configuration -> Instrumentation - Transaction Detection
Agent Type = Java
Entry Point Type = Servlet
Exclude Transactions discovered by this rule
Name = Custom - Exclude /my/example
Priorty = 10
Scope = Default Scope
Rule Configuration tab
URI = Equals : /my/example
Here's some additional documentation that might help: