I get this error: Error detected attemting to load package: FTBSparkTPoseAutoDetect

I have the same problem and get the same error message

Same here! Hope someone finds the issue concerning this error.

You're not alone friend, same issue here.

I unsubscribed to all the mods, even the cosmetic. Resubscribed and used the original mod launcher from steam I now it is working.

Try the original mod launcher, seems to work there

wasted time to download all the mods. no longer able to start the game. smh

Same. I got the FTBSparkTPoseAutoDetect error so I disabled those two mods. But now I am getting the error for OneMillionColoursPluginForWOTC. Originally I subscribed to all the mods but that wasn't working. I even validated the game files to make sure.

I had the same error until I downloaded the alternative mod launcher.

Originally posted by AlexJones:

I had the same error until I downloaded the alternative mod launcher.

Is this from the launch option menu and you're referring to the "new mod launcher"? I am having the same issues as those above and tried their troubleshooting steps to no success. New mod launcher give me the same error codes as above and original mod launcher doesn't bring the game up despite it saying it's running. Did you download a different launcher?

Originally posted by TheLostDark:

Try the original mod launcher, seems to work there

The original mod launcher worked for me as well.

I downloaded the alternate mod launcher from github,and it's worked for me with that,just took a good 2-3 minutes till it launched,i thought it is frozen/not responding,but it doesn't. Just give it time to load in all the mods.

also having this problem, nothing I have been able to do has fixed it

Guys, after googling half the internet and brute forcing 150+ mods on this collection I found the issue(It took me only 4 hours). Just disable this mod "Templar Mage and Revised Caster Gauntlets". The game still takes 2-3 minutes to start but there is no infinite waiting on start or random errors popping now.

The issue from the past few days has been temporarily fixed from the Perk Pack end. Needs an update to the Gauntlets mod to resolve properly, but everything should work again for the time being. May take a bit for Steam to grab the update.