Problem with Cosmo System

I cannot insert any item in here, i dont know why. Does anyone knows how to solve this problem?

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You can't use 2 same star in yellow slot, you have 83 lvl and you use blue stars?

I dont have anything better for yellow slot! i alaways got red and blue.

This pics are for Pegasus:

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Here's mine for comparison.

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By blue. I think BadPicollo meant the rarity of the item. In the picture you linked, the name is in blue. You should be using orange ones.

No, i try with orange too but didnt work. I think is as p98s say, i will try to get another one with diferent text

You can see in your pic that where the "planet" is yellow boarders. You need to put in a Main Order piece.