Velocity Scripting key not found

[Shubhika]

Hi All

Need help to find solution to this or if there is any specific resource for me to refer. 

We do have some transactional emails with custom objects and velocity scripting. We migrated these to a new instance and when I am trying to approve the emails, I am getting the below error. Can anyone help me find a solution?

[SanfordWhiteman]

We’d need to see your Velocity code. This isn’t enough to go on.