TIFF: Unkown LZW compression scheme (Predictor Tag ≠ 1). 

You can only open uncompressed BMP´s. Please contact the autor.

IFF/LBM: Error while converting HAM. You can open only standard HAM´s (6 bit planes) yet.

GIF: Error while extracting LZW. Loosing some pixels.

TIFF: Error while extracting LZW. Loosing some pixels.

Selection contains nothing.

TIFF: Unknown command in CCITT3.

TIFF: Unexpected EOL command in CCITT3.

TIFF: Old LZW compression algorithm.

No 'STR#' resources available.

Picture in use from a layout. Can´t close picture. First close layout window.

System error: 

Version conflict or file isn´t a  layout.

GIF contains not picture.

No enough memory for undo!
Probably close other windows.

Unknown format.

Printing from finder not possible.

No GEM-Metafile.

Graphicconverter can´t open the following TIFF compression algorithms:
CCITT 3 and 4 (faxsimile compatible)

No PICT in resource fork available.

No resource fork available.

Clipboard contains no 'PICT'.

You can only open greyscale RIFF´s. Please contact the autor.

Not enough memory to build PICT.
Probably close other windows or use “Segment”.