ID:271000 Can't process assignment. Attribute name "<name>" is illegal -- use a legal attribute for assignment in ALTERA_ATTRIBUTE assignment.

CAUSE: You specified the ALTERA_ATTRIBUTE assignment, but the specified attribute is illegal. All attributes specified in the assignment ALTERA_ATTRIBUTE must use legal Quartus Prime assignment names. The Quartus Prime software cannot process the assignment unless the attributes, attribute values, and attribute format are legal.

ACTION: Verify that the attribute, attribute value, and attribute format are legal.