Toshiba NX 76 ABS-Scale Data is invalid

Hello just wondering what could be the issue with our Toshiba NX 76 Horizontal Mill.
It gives the message NC1_028 ABS-scale data is invalid. I thought it had to do something with the Y axis Linear Scale as we had previously had Y axis encoder alarms, I cleaned the scale and reader and nothing changed, then looked at the rotory encoder at the top of the Y axis ball screw motor and it was perfectly clean.
I am not even sure what the ABS Scale is?. Maybe its a program issue and not mechanical?.
Any help would be great.

Thanks

From what we know now with a talk to Toshiba, They think the Y axis Linear scale is dead,
So i am thinking for now we need to deactivate the Y axis linear scale, Looking on how to do that....
It seems like it can run with out it, just using the optical scale on both Y axis Ball-screw Motors,