Illustrator Not Responding

[DIGITAL24098756tskb]

When I try to change spot color to process color, Illustrator Automatically got Error and Not responding

Kindly help me with this immediately

[Ton Frederiks]

Does look like this is not the spot color from the Pantone color book.

If you have those installed, try to make it a Book color and try again.

[Met1]

Are you creating your own "PANTONE Blue 072 C"?