ASMA153S START statement illegal - CSECT already begun

Explanation
A START statement occurred after the beginning of a control section.

System action
The statement is processed as a CSECT statement; any operand is
ignored.

Programmer response
Ensure that the START precedes all machine instructions and any
assembler instruction, such as EQU, that initiates a control section.
If you want EQU statements before the START, place them in a dummy
section (DSECT).

Severity
12