I've created a text object and a rectangle and want to round the faces of where the two meet to make it look like a moulded brick. I've tried using the trim \split tool with stitch and round ticked, however i always get 2 error messages no matter how big or small the distance, "unable to complete smooth moulding operation" & "Inappropriate combination of objects selected for the Trim\Split operator". I've also tried the round facs tool and adjusted the fillet radius amount from 0.01 to 100 but get the error message "unable to complete smooth moulding operation".
Can someone point me in the right direction as to where i'm going wrong? File and image attached, thanks in advance.