Icicles (v.22.0) installed from elpa (package-list-packages)
Emacs version
$ emacs --version
GNU Emacs 24.0.90.1
Output on emacs start
Warning (initialization): An error occurred while loading `/home/exu/.emacs.d/init.el':
Symbol's function definition is void: hexrgb-canonicalize-defined-colors
To ensure normal operation, you should investigate and remove the cause of the error in your initialization file. Start Emacs with the `--debug-init' option to view a complete error backtrace.
Debug init below: Link to GIST error dump
You should not get such an error. Sorry for your trouble. The error message is saying that something tried to call function hexrgb-canonicalize-defined-colors but it was never defined. It was not defined no doubt because you do not have file hexrgb.el in your load-path. That's OK, but in that case, it should never be called.
hexrgb.el is an optional file for using Icicles (but it is recommended) -- see optional Icicles libraries.
Follow up by email, if you can -- that's easiest: M-x icicle-send-bug-report. Let me know what Icicles files you have etc. Preferably, test by starting from emacs -Q (no init file). Set debug-on-error to t, add the Icicles files to your load-path, M-x-load-library icicles, etc.
For debugging, use only the source Icicles files (*.el, not byte-compiled, *.elc). Remove any byte-compiled Icicles files from your load-path. Thx -- Drew