I always get this error message everytime I add a custom scenery or biped I downloaded from halomaps.org

Heres the error message:

Not all tags could be added to the palette
you selected one or more files that couldn't be loaded correctly.

Contact your nearest Bungie Programmer for assistance

It means that there are tags missing. Click Ok after you get the message and you should see text appear on the screen, saying which files are missing. Quickly printscreen this and paste it in paint. Go through the files it mentions and look for red text.

Im sorta new to this, but is there a video explaining how to fix it, cause im confused when someone tells me how to fix by typing

There might be one out there, but this is kinda basic stuff, and by the time someone decides to make a tutorial, they usually have a lot of knowledge about HCE in general, and they sometimes assume that others have comparable knowledge. I'd be glad to walk you through the process step by step. When you get the error message, proceed as if everything is normal, like you just put in a working vehicle. When you exit all those dialog boxes, you should see white text that appears on your screen saying things in what probably appears to be in a foreign language to you. This text will only stay on the screen for 15 or so seconds, so you need to get a screen image of it. This is accomplished with the print-screen function. On your keyboard should be a button that says PRTSC. Click this and an image of your monitor is stored by the computer. Now, you need to move this to a file. Open paint and paste it in there. Save the image. Send the image to me at rickreid@gmail.com, and I can tell you which files are missing, which files you will need and how to do all of that.

First, open sapien, try to use that tag that has the "error". Right when that popup comes up saying contact your nearest bungie staff, click okay. Then, right after, open debug.txt in your halo ce root directory and post the latest paragraph.