caught a typo in the code...

mods.astralsorcery.Altar.addAttunmentAltarRecipe

Works as intended. Correct spelling of attunement .addAttunementAltarRecipe will throw no such static member error.

Error found in 1.10.2-1.4.5

Not providing support for 1.10.2 and 1.11.2 versions.

Regardless, as it persists into newer versions, i'll roll out the possibility to make it work with both "Attunement" and "Attunment"

Both methods are added for the next version so either will work as of 1.8.3 then