Game cant launch: "fallout 4 is attempting to launch with optional parameters shown below: -len"

[maddadicusrex]

Anyone else having this problem between Steam and Game launcher? Started with download of game updated version and latest F4SE. I have the newest AAF and that is getting caught up with F4SE becoming disabled because of the glitch. Had it all working for 10 minutes and minimal mods. The next load up and crap hit the fan. Seems I am not the only one. Is the latest AAF married to the newest F4SE and game version? Can I try a rollback without messig up AAF? Thanks

[Oldwolf58]

Don't know what all you have loaded but the first thing I did for the NG Fallout 4 was disable all mods. Load F4SE, address library, xpse plugin loader, buffout 4 and all requirements for all of them. Load them into the Game directory NOT through any mod manager. Fire Up the game using f4seloader and make sure the game fully loads and runs all the way to vault 111. Then start loading mods no more than a half dozen at a time and fire the game up after each set of mods again all the way to loading the base 111 save you made with just the f4se stuff. If at any point it doesn't start correctly and I mean load all the way into a game, then you only have the last batch of mods you added to sort through. I had a bitch of a time getting the NG version running but it was mainly the fact that address library and buffout 4 weren't playing nice and needed to be re-downloaded and reinstalled. Hope that helps some.