Hey, welcome! There's a
subforum specifically for modding help, so a (forum) mod will probably move this thread there, as this is for issues/help with the vanilla game. Like Ereo said though, no one will be able to give any help without more info. You can find and upload your SMAPI log by following the instructions
at this site. Can you also clarify what you mean by "no access" ? Does the door not work, or...? It may well be obvious in the log what's going on, but if not, more info is better!
(It's pretty unlikely that your save file will be permanently affected or anything, so don't worry about that -- it's more that because it is
possible, especially for very specific issues/circumstances, removing a mod is not generally enough to "prove" that a problem is within the vanilla game, unlike a fresh save.)