Strange wall problems

I've been trying to create an episode but I keep running into a few problems.

1. Game displays Error: could not read file at startup. I'm assuming I'm missing something, but I think everything's there.
2. From the start screen, I cannot go left, as I hit an invisible wall. My walls match up, so it's not the cause.
3. From the start screen, I can go right but I get immediately stuck in an invisible wall and cannot move. Again, my walls match up.

If you need more info I can upload the level.

1. i dunno
2. its probably from the 24bit png mask thing
3. that is a saira "wallswim" (I think thats what your talking about). in the editor, did you scroll to the left and check if the wall matches up there?

1 is that PDA.ccn and Sound Module.ccn must be included in the level directory. In case you use the starmap, then Starmap.ccn must be included too.

1 is that PDA.ccn and Sound Module.ccn must be included in the level directory. In case you use the starmap, then Starmap.ccn must be included too.

Thanks! It's fixed.

1. i dunno
2. its probably from the 24bit png mask thing
3. that is a saira "wallswim" (I think thats what your talking about). in the editor, did you scroll to the left and check if the wall matches up there?

2: No, I already fixed that.
3: Yes, and it matches.

It helps if you upload the tileset and mask so we can check the files, because obviously what I did when I designed them works. Oh, and note that a tile on the edge of the screen can't be too complex, because an extra copy of the mask is created outside the screen to act as an extra tile, preventing enemies to fall down when they exit a screen.

Here's the tileset and mask.

Also included is an image of the boundary in problem #3.

EDIT: I noticed that the materials lines in the Planet.ini kind of correspond with the tiles, but do they have any significance?
EDIT 2: I changed them around, but I don't see anything that was affected.

Hmmm, I'm a bit confused now. It seems to be correct. The invisible wall appears only if the game can not find a screen at the other side, but obviously there is one there according to the editor. I don't have any idea why this happens, perhaps you could send the level itself?

that was happening to me, then i changed the mask to 24 bit png and it started working again! 
check if it is 24 bit!
the planet.ini symbols are the diffrent sounds it makes when you walk on it!

that was happening to me, then i changed the mask to 24 bit png and it started working again! 
check if it is 24 bit!
the planet.ini symbols are the diffrent sounds it makes when you walk on it!

Nope, that didn't fix it. I'm uploading the level now.

EDIT: Here it is.
http://www.mediafire.com/?kzoonljingx

The problem is your tileset mask. You are using more colours than white and pure magenta. Zoom in and look carefully at the top-left tile and the one underneath. Look at the edges where the white meets the magenta.

Ugh, I fixed it. The color difference is so subtle I didn't even notice it  Must have been something Photoshop did when I was filling it in. Thanks 

I think it happens if you don't disable antialiasing for the selections tools. I'm actually unsure why the problem happens on the left side of the screen instead of everywhere, but the wrong colour is definitely the reason.