Gin indexing in postgres

I have four columns project_id, custom_event(boolean), page_view(boolean), event_url(text). I usually do like a regex operation in event_url column and my query will be all the four columns in that order I specified. When I try to create like this CREATE INDEX event_url_index ON event_data USING gin (project_id, custom_event, page_view, event_url gin_trgm_ops) it's giving me an error like this > data type boolean has no default operator class for access method "gin" Can anyone help me how to solve this issue?