Hello all pymol users

I am new to pymol and trying to open a .xplor map file in pymol to get the electron density map of publication grade.
The command i write for pymol to open the file and show electron density map  is -

1) I convert ccp4 .map file into the .xplor file through mapman.

# mymap.xplor loaded as " mymap" loaded as state 0.
2) Then i load the .xplor map file into pymol and write the following commands-
isomesh map, mymap.xplor, 2.0, site, carve=1.6

isomesh: map or brick object "mymap.xplor" not found.

What could be the problem? can any one give suggestion to solve it?

Thanks in advance