Error During Export of Table to .shp file - PostGIS

[blackwidow]

Hi Guys,
Im following the tutorial here on GPS FileDepot on creating .img maps and I did almost everything right so far but when i attempt to export the table to replace the .shp file the files in the folder are all grey and inaccessable then when i click open I get an Error : error function postgres version() does not exist


I'm thinking this error is due the inaccessable .shp file to be replaced.

Any help wou;d be appreciated. I tried almost everything I know.

I'm using PostGIS Shape and dbf file loader 2.1 plugin. Thanks.