Error message appear when the AECOSim file opens

hello

I  have installed  AECOSim  building designer  and when i open a file  and closing a file  error message is appears . when i click "ok"  i still can continue further  the file can also open and close  it,

the message as followings. how to solve this matter , how to stop this message appear continuously. the message as followings .

REI 

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