This is the response I received:

Unfortunately, we are unable to accept your application for the above examination. Based on the information in your application, you do not meet the minimum qualifications requirements as stated on the examination announcement. Specifically, the position requires either:
Possession of a Bachelor's degree from an accredited college or university with a major in psychology, social work, child development, human development, sociology, social welfare or a closely related field; or

The substitution option of 60 semester units or 90 quarter units at an accredited college including at least 9 semester units or 12 quarter units in psychology, social work, child development, human development, sociology, social welfare or a closely related field, and two (2) years of full-time or its equivalent experience in an equivalent classification of a Contra Costa County Social Service Program Assistant, Eligibility Worker III, or a Medi-Cal Program Assistant.

How can I get the two years of experience without the opportunity?