Unable to change Problem State from "New" to "Assess"

[sameer S]

Hi, 

I am trying to update the problem state from new to access through script and I am getting below error.

"Invalid state transition. Can not update from state 'Assess' to state '(-4)' with given values." 

I tried changing the value to 102. It doesn't give error but it doesn't change the state either.There is one more value 152 for Assess . Tried that and it throws error. 

Please advise

Thanks & Regards,

Sameer Sudan

[sameer S]

I added the below. Still the same error. Is this model wrong? please advise