The days of "the Forum" are basically over. Nowadays reddit, Discord, facebook and so on are used to communicate with the player base. This I have seen with most games I play(ed). There are pros and cons to this. Personally I miss the "old days" of single thread forum discussions. Discord and...
What I used to do was open the config file and remove the reference to the attachment points which caused the error message. It worked fine afterwards. You do however have to keep in mind most of Martin's locomotives were made for the oler versions of the game and during the years n3v changed so...