Message type: E = Error
Message class:  CNV_MBT_DEX - DMIS Data Extract related messages 
Message number: 236
Message text: Error in preparing files
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_DEX236 typically occurs during data migration processes, particularly when using the SAP S/4HANA Migration Cockpit or other data migration tools. This error indicates that there is an issue with preparing files necessary for the migration process. Causes: File Path Issues: The specified file path may be incorrect or inaccessible. This could be due to permission issues or the file not existing at the specified location. File Format Problems: The files being used may not be in the expected format or may be corrupted. Configuration Errors: There may be misconfigurations in the migration settings or parameters that are causing the process to fail. Insufficient Resources: The system may not have enough memory or processing power to handle the file preparation. Version Compatibility: The version of the migration tool or the source system may not be compatible with the target system. Solutions: Check File Paths: Verify that the file paths specified in the migration settings are
 Get instant SAP help. Sign up for our Free Essentials Plan.
Get instant SAP help. Sign up for our Free Essentials Plan. 
CNV_MBT_DEX235 Error retrieving no of files
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_DEX234 Package & does not exist
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_DEX237 The estimated size of the files in bytes are &
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_DEX238 Access planid has not been assigned
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.