List index out of bounds

[Powerslide]

When I put a few textures on my island, save it, then go to open it again I get List index out of bounds (62354) error. Does anyone know what this is and how to fix it?

[dwolf]

 You probably are not saving it correctly.After clicking the select all cells and you have "expert mode" checked under flags tab,do that first,Select flags tab,then change to ground
on the drop down menu,then click change,then click default.
 Any variations from this will usually cause problems.Dont forget to backup.Even better go here and read the tutorials
on wrpedit,explains everything very well.
http://www.res-command.com/internalediting/index.php