RSX-11 trouble

[supervinx]

Hi!
Got a MicroPDP 11 plus.
It seems to be misconfigured.
It can't execute .CMD files, reporting
Task "...AT." terminated
Load failure. Read error

No disk errors are reported with ELI DU0:/SH

Disk seems to work: I can run .TSK files.
The file STARTUP.CMD isn't read at all.

Any hints? Which file is executed right before STARTUP.CMD?
I see two RED commands and a MOU before it tries to read [1,2]STARTUP.CMD and reports the aforementioned error.

Thanks