[eclipse-users] Newbie: dim in .ecl script

Hello,

I have a file called testdim.ecl which contains the following line of  
code:

dim(M,[3,3]).

Whenever I type [testdim] in TkEclipse I get the following message

*** trying to redefine a built-in predicate: dim / 2
	before line 2 in the file //C/DOCUMENTS AND SETTINGS/PDER/DESKTOP/ 
testdim.ecl
testdim.ecl compiled traceable 0 bytes in 0.00 seconds



Why can you type dim(M,[3,3]). in tkeclipse and not load a file into  
tkeclipse containing dim(M,[3,3])?

Many thanks.

Philippe