P38A Anti stall fault

Hi everyone I need some help!

The problem:
Nanocom shows -> ANTI STALL FAULT (Invalid shaft sensor data)
This is error is really the shaft sensor problem?

After I clear the fault and go for a ride the transmission from 1st instantly change to 3rd and the above fault occurs immediately.
The only strange problem is when I check the transmissin inputs with nanocom the:
shaft speed km/h shows 0
shaft speed mph shows 0

I search the internet about the problem and found some solution:

1. Crankshaft position sensor fault
Workaround: I replaced with a new one

2. Automatic transmission shaft sensor
Workaround: I check sensor resistance and its ok about 320-330 ohm. Just play safe replaced with new one.

3. Cable loom
Workaround:
I've checked all cables
from trans to ecu
gems to ecu
inside the trans to ecu
and every cable works (resistance: about 1-1,5 ohm)

4. Oil level:
Workaround: Because of transmission sensor replace I changed the oil and with cold oil in neutral I fill up to close to max. After a day I checked and it was ok when idling.

5. Gearbox ecu?
is it possible that the gearbox ecu wrong or my problem still in the dark

I appreciate any help!

Thx: Greg!

Looks like the one sensor you have not tried is the ECU temperature sensor that is green one between No 4 and 5 cyl on the cylinder head I know from experience that they can give wierd gearbox faults.you havnt put weather its petrol or diesel .
That sensor is on the diesel.

Sorry I forget to publish the car specs:
MY95' Range Rover P38 4.6 HSE GEMS

New error when I remove the igniton key from lock, the selector light won't go out, still remains red on the correct gear. Next week I try to get a working ecu, becuse it's not a healty.
Had anyone got the same problem?

Problem now solved. It was a mechanical problem in automatic gearbox. Yesterday I take off the whole engine-gearbox-transferbox. After I diassembled the gerabox rear part, I found that the gear which is responsible for shaft speed losen from the shaft and freely rotate. I find the the 2 losen screws below the gear, and I tighten it. Now I need put all back together and need a test.

Just a small update the gearbox works well!