[TxMt] Error: Document ... not open in application. Can't make file ... into type alias

Dear Textmate Experts,

I get the following error message on compiling a document called mydocumentname.tex:

Document '/Users/myusername/myfolder/mydocumentname.pdf' not open in application execution error: Can’t make file "Macintosh HD:Users:myusername:Desktop:mydocumentname.pdf" into type alias. (-1700)

"myfolder" actually stands for a path where the document mydocumentname.pdf is located. It is unclear to me why the path "Macintosh HD:Users:myusername:Desktop:mydocumentname.pdf" appears, because the file mydocumentname.pdf is obviously not on the Desktop. Maybe understanding this solves the problem. I am also not sure if this is a serious problem, the generated .pdf opens in Skim as supposed to.

I work with textmate (version 1.5.8 (1505)) on Mac OS X (10.6.1).

Any help is appreciated.

Marius