Fighter Factory Error? - This turret can't be integrated into a fighter

[BaronTox]

Does anyone know why I would be getting this error from a fighter factory?
I have a 199 block fighter from the workshop. Verified it was 199 blocks.
Good relationship with factory faction.
Adding any turret, mining, sprayer, pulsar, etc. single slot, two slot, 1 gunner, 2 gunner, etc...

i have tried every config change, including two other workshop fighters and still...
I select the fighter design, select the turret, adjust the settings, and get:
'This turret can't be integrated into a fighter.'

Tried without editting settings and still get this... arg!

[BaronTox]

Update:
I was able to create a mining fighter with a Green turret, but not a blue turret.
Why can't I use a higher quality mining turret to create a fighter in 'Good' relation Fighter Factory?

[BaronTox]

Update:
I am now allied with this faction in Xanion region and still cannot make a fighter out of anything above Blue. I was able to make a salvaging fighter from a blue Xanion recycler, but nothing above blue will let me create a fighter...

There needs to be two changes to the fighter factory.
1. Add a Factory filter to my turrets. If it wont allow a turret, just shade it out so i cant select it.
2. Some real error messages would be appreciated. Telling me it 'cant be integrated' is a not a reason or direction for me to take to correct the error.

[CMDR Sweeper]

Or better yet, an override button to force them to do, just like it would be in real life.
An example here is the Bradley IFV and the messy process described in the movie "Pentagon Wars"

[BroodingSnow]

Is it a unique named turret your trying to use? I know some of the fancy ones cant be changed to fighters, like the multiharvest etc

Edit: Just tested a legendary cannon that worked, but the yellow romantisizer does not. Both with no stat modifications.

Can you link the fighter designs youve tried, just incase your the lucky one that finds 3 that dont work anymore?

[General Lee]

It appears some turrets cannot be turned into fighters. I am mostly having trouble with the special ones that have a red text subtitle. I have a Pulsing Recycler P-400 salvaging turret i really want to turn into a fighter. There is no in-game explanation as to why these turrets can't be turned into fighters. Just an error that says it can't be integrated. Very frustrating!