FATAL: Section "conflicting banks" is defined with bank 4, but also with bank 1
    at section-union/bank-conflict.asm(5)
    and also:
    at section-union/bank-conflict.asm(5)
Linking aborted with 1 error
---
error: Section already declared with different bank 4
    at <stdin>(14)
FATAL: Cannot create section "conflicting banks" (1 error)
    at <stdin>(14)