getting the following error message with Trados 2019 La référence d'objet n'est pas définie à une instance d'un objet

Hello and thank you in advance for your help!!! I keep getting the above message when I try to confirm the translated segment. I have tried to save my translation but lost everything. I run Trados 2019 on a MAC with parallels. I need to turn back my document tomorrow and would appreciate any help. Thank you!