More than one Private Location was defined to the Workspace used for BlazeVSE.
Release : SAAS
Component : BLAZEMETER MOCK SERVICES
Note: We do not support sharing of private locations across Workspaces for BlazeVSE. It is recommended that a new private location is created for each BlazeVSE within a workspace.
Once one of the Private Locations was removed, this resolved the error.