Getting this message on screen while doing all lost keys on fem.

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sorry image not good but this is what it says

Error while flashing the ECU, please do a full update before you start adding keys or changing ISN.

Not had this before can somebody tell what this means and what i should do next please

This message is asking to update the fem before programming the key or changing isn. Already fem unlocked/mileage reset completed, so no need to do unlock procedure again but please do programming for fem and then program key and it will be ok.

Hi Just an update incase anybody gets same problem
I it gave me key file then when i click to save which it did thats when the message come up. so i tried the indv/programming but wouldnt let me do it?
so anyaway i thought its given me the secret key file so if i restore the FEM and i thought i`ll try to see if it would now let me progrom a new key? so went to key learn ect, it ask me to load key file> put key into keytag all ok read key then select key slot yes>program key yes> put key next to coil on FEM all good> programmed the key.
so went back to the car this morning and yes all worked ok no problems. the only one thing was when i 1st pressed start button it would not crank so i looked at if key was inabled it said no so i put near the column and it then change to yes and the the car started ok. after that it started ok without key next to the column. job done