After upgrading to z/OS 2.4 and applying the JCLCHECK maintenance to support z/OS 2.4 the following message is issued during the EDCHEK process of a JCL:
CAY6300S ALLOCATION ERROR, DAIR CODE:035C
Release : 12.0
Component : JCLCheck Workload Automation
Check that the JCLCHECK load library containing the maintenance for Z/OS 2.4 is in Linklist.