Finally I've found the reason, sorry that I'm so stupid ! I've put it into the blockstates folder, not the models/blocks folder, however, thx for helping
I've just created a new model with wooden planks textures and rotated/moved it (In Rotations/Positions that MC should accept) saved it as .cubik file and then exported it as .JSON file into the resourcepack, then it showed the failure texture and I've written this thread... That's what I've done to ...
Her if you can help xD I don't understand anything of this but maybe you :)
Unable to load definition minecraft:pink_stained_glass java.lang.RuntimeException: Encountered an exception when loading model definition of 'minecraft:pink_stained_glass' from: 'minecraft:blockstates/pink_stained_glass ...
It doesn't work I've tried it with glass_pink.json and again with pink_stained_glass.json and both won't work how you see below, nothing happened with the model of pink glass and with pink_stained_glass.json it does make this failure again