Message type: E = Error
Message class:  LSOPV - Training Management (Copy of Message Class PV) 
Message number: 374
Message text: No participants are booked for course &
Since SAP believes that this specific error message is 'self-explanatory,' no more information has been given.The majority of messages in the SAP system have a message text, however this is frequently insufficient to comprehend or resolve the problem.
To make things easier, more detailed information is frequently added to describe the issue, how to fix it, and the necessary steps or configuration modifications.
Unfortunately, there isn't any extra information in this error notice.
First, use our AnswerBot below to get a possible cause and solution (requires a premium subscription).
Also, review the in-depth Common Questions & Answers listed below; you could discover a solution there or be able to connect with others who have faced similar challenges.
You can also try searching the SAP support portal (support.sap.com) but you need a special user ID to access it. It is possible that an SAP support note exists that provides additional details about the mistake or even steps for fixing it.
The SAP error message LSOPV374 ("No participants are booked for course &") typically occurs in the context of SAP's Learning Solution (LSO) module when you are trying to perform an action related to a training course that currently has no participants registered.
Cause:
No Registrations: The most straightforward cause is that there are indeed no participants registered for the specified course.
Course Status: The course may not be active or may have been canceled, leading to no participants being able to register.
Selection Criteria: The selection criteria used to view or manage the course may not include any participants due to filters or settings.
Data Issues: There could be data inconsistencies or issues in the backend that prevent the system from recognizing registered participants.
Solution:
Check Course Registrations: Verify if there are any participants registered for the course. You can do this by navigating to the course details in the LSO module.
Review Course Status: Ensure that the Get instant SAP help. Sign up for our Free Essentials Plan.
Get instant SAP help. Sign up for our Free Essentials Plan. 
LSOPV373 Course & is not assigned to any course type
Self-Explanatory Message Since SAP believes that this specific error message is 'self-explanatory,' no more information has been given.The majority of...
LSOPV372 Related objects could not be locked
Self-Explanatory Message Since SAP believes that this specific error message is 'self-explanatory,' no more information has been given.The majority of...
LSOPV375 Course & was firmly booked
Self-Explanatory Message Since SAP believes that this specific error message is 'self-explanatory,' no more information has been given.The majority of...
LSOPV376 Course & was canceled successfully
Self-Explanatory Message Since SAP believes that this specific error message is 'self-explanatory,' no more information has been given.The majority of...
Click on this link to search all SAP messages.