Error in chol.default((value + t(value))/2) : the leading minor of order 2 is not positive definite

I am trying to run this :
#4. Between-person differences in within-person associations => Eating and Negative Interactions cognitions ~ 1 + behaviors.state + imean.behaviors,
random= ~ 1 + behaviors.state|Participant/Dyad.x,,

And get the error. Could someone please help me ?

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