Due to the lack of memory, the effect can not undo.

A file has not been saved due to lack of memory.

Copy or Cut has not been done due to lack of memory.

Paste has not been done due to lack of memory.

You can not increase the number of color on the canvas due to lack of memory.

You can not make the canvas larger than it is due to lack of memory.

You can not select the area you specified due to lack of memory.

You can not use this tool because of shortage of memory.

Lack of memory because the document is too large.  You may not use some tools and undo command.

A file has not been opened due to lack of memory.

New canvas has not been created due to lack of memory.

Paint-at-that has not been booted due to lack of memory.