There is no information about this error because as it seems, the software is not publicly available and it's instead provided "in-house". This is an application used in government area which means you will have to take advantage of the support offered through proper channels.
Luckily, the software is still supported and there are ways to get in touch with the support team.
Access the link posted below and get in touch with the proper person.
Contact page: http://www.hec.usace.army.mil/software/support_policy.aspx