The solution is to add the .txd file to the models folder
Also, do not use iPLEOMAX - it's pretty outdated, have this:
https://mega.nz/#!N9QgXboL!xOYU0n4DKBxe43YAFOf09qx_aS78DhDckQh4Rttgbc4
Using Pawn.CMD?
If you're doing so, this is the very first sign that you absolutely shouldn't utilize your all powerful P-Code knowledge in any of the scripting discussion topics.