Noncatalog request by employee - email approval notification content was not generated

Content

Hello,

An employee has requested for a noncatalog item, and have submitted his request successfully. However, he received the following notification instead:

The email approval notification content was not generated.

Please go to the Workspace Application to view transaction details and act on pending approval tasks.

This is an automatic workflow email. Do not reply to this mail.

May I know what does this mean? Has the approval notification been sent to the line manager (that's our approval workflow)?

Also, how do we check whether there's an error and where is the current approval at?

Thanks everyone!