An error message "Object reference not set to an instance of an object.", when upgrading TM.

When I upgrade the memories by opening the package which received from the translation agency,

an error message appears.
"Invalid date string: 02-05-14 00:32:53."
"Object reference not set to an instance of an object. "

So I can't upgrade them.
I'm using Trados Studio 2017 SRI CU15.
Please tell me how to solve it. Thank you very much.