Message type: E = Error
Message class:  CNV_MBT_SNAP - Messages for Snap Schor Integration 
Message number: 157
Message text: Creation of Snap Shot was started.
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 CNV_MBT_SNAP157 typically indicates that there was an issue during the creation of a snapshot in the context of a data migration or conversion process. This error is often associated with the SAP Landscape Transformation (SLT) or SAP Data Migration tools, particularly when using the SAP S/4HANA Migration Cockpit or similar tools.
Cause: Insufficient Authorizations: The user executing the snapshot creation may not have the necessary authorizations to perform the operation. System
Configuration Issues: There may be configuration issues in the system that prevent the snapshot from being created. Database Locking: The database might be locked or busy with other operations, preventing the snapshot from being created. Technical Errors: There could be underlying technical issues, such as problems with the database connection or system resources (e.g., memory, disk space). Inconsistent Data: If the data being processed is inconsistent or corrupt, it may lead to errors during snapshot creation.
Solution: Check Authorizations: Ensure that the user
 Get instant SAP help. Sign up for our Free Essentials Plan.
Get instant SAP help. Sign up for our Free Essentials Plan. 
CNV_MBT_SNAP155 No Snap Shot Profile was provided!
Self-Explanatory Message Since SAP believes that this specific error message is 'self-explanatory,' no more information has been given.The majority of...
CNV_MBT_SNAP154 Profile for SNAP Shot: &1.
Self-Explanatory Message Since SAP believes that this specific error message is 'self-explanatory,' no more information has been given.The majority of...
CNV_MBT_SNAP159 Production Database: end of Hot Backup Mode.
Self-Explanatory Message Since SAP believes that this specific error message is 'self-explanatory,' no more information has been given.The majority of...
CNV_MBT_SNAP160 Snap Shot was created. Mount Process has been started.
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.