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You have to put the message file mycustomMSG.msg into the subfolder msg of your project folder custom_msgs. If it does not exist, you have to create the folder msg and püut the message file into it. add_message_files does not look directly in your project folder but only in the msg subfolder, i. e. if you message files lies there (next to CMakeLists.txt and package.xml) it won't be found..............