Custom Page module and Themes

Hi...

I've just installed the Custom Page module but it doesn't work with some Themes. This module doesn't work with the Salamander Themes.

I got the following error:

custompage could not find an appropriate theming function or template file for this path [migrando].
The viable options (in ascending priority) are:
'phptemplate_migrando' in any module
'THEMENAME_migrando' in a theme with the name THEMENAME
custompage-migrando.tpl.php template file in a current theme
Please make sure at least one of these exist and returns a non-empty output

How could I fix it?

Thanks