Hi,
When you are generating the EHT guess for the Cu2+ ion, define asks you the following question:
DO YOU WANT THE DEFAULT OCCUPATION ASSIGNMENT FOR ATOMS ?
INFO=i ; DEFAULT(n)
Here you should answer "n" (the default), which will generate unrestricted KS orbitals. If you enter "y", define will generate restricted-open orbitals, which are not compatible with DFT. This is most likely the reason your calculation crashed.
Best,
Antti