Please make sure you are ingame (health, food, stamina is visible on the screen) before pressing F1. Also make sure you are playing OFFLINE and SURVIVAL mode.
thats what i forgot was to put it on offline, but i did have everything else right. but with all these stupid little updates i'm getting the error so i guess it probably does need to be updated now. really don't need a trainer but the Stamina runs out so fast so the trainer is nice for that. right now the game version is v0.5.20.668ABC. but know one has reported it needing updating so i don't know now if its just me or if it does need to be updated just know one got around to do a report yet. i'll just wait and see if anyone does.thanks anyway 0x90.
The current trainer still works fine on my end with latest steam version. The only thing that might matter is that I jump after I got ingame.
Here is a demonstration video showing the trainern works:
this is really odd. i did just as you did in the video i jumped around i ran around then tried it still got the error. i tried making a new world still wouldn't work. i even copied the trainer from my trainers folder into the folder withe the game exe file still got the error. don't get it, been using trainers on here for years always work ok, don't get why this one wont work for me. i give up for now, maybe i'll try again another time.