there are multiple threads with this... next time please search and look before posting a thread.
but, i'll humor you.
go to your GB folder. find Debug.html find badNodes.xml
open both in notepads ... at the end of the debug.html log you'll find what killed you, go just above that, it will say Saronite Deposit (###### ###### ######). highlight this #.
alt tab to badNodes.xml, copy and paste a current blacklisting of sar ore at the bottom of the list, but before </blacklist nodes>, delete the # # # in the newly pasted line, go back to debug.html and copy the highlighted section, now go to your badnodes.xml and paste into the section you deleted. save. now restart GB
note: each time you start a new GB, the debug file resets itself.