ID:268010 Post-fitting nodes may not be tappable when incremental compilation is not enabled for the project or when you are using the web edition. See the Messages window for more information.

CAUSE: You assigned the specified post-fitting node to a Signal Tap File (.stp), but incremental compilation is turned off. Post-fitting nodes may be added only with incremental compilation turned on. This message is a submessage of the message that precedes it in the Messages window and Messages section of the Report window.

ACTION: Assign Signal Tap pre-synthesis nodes or, to insert Signal Tap post-fitting nodes, turn on incremental compilation.