Message type: E = Error
Message class:  CNVMBTPLK - SAP LT production lock 
Message number: 038
Message text: Package does not exist or is not a PCL or CWB package
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 CNVMBTPLK038 indicates that the system is unable to find a specified package, or that the package in question is not recognized as a valid PCL (Package for Conversion Logic) or CWB (Conversion Workbench) package. This error typically arises during data migration or conversion processes, particularly when using SAP's Migration Cockpit or similar tools. Causes: Missing Package: The specified package may not exist in the system. This could be due to an incomplete installation or configuration. Incorrect Package Type: The package may exist but is not of the expected type (PCL or CWB). This can happen if the package was created incorrectly or if it has been modified. Authorization Issues: The user may not have the necessary authorizations to access the package. System Configuration: There may be issues with the system configuration that prevent the package from being recognized. Transport Issues: If the package was transported from another system, there may have been
 Get instant SAP help. Sign up for our Free Essentials Plan.
Get instant SAP help. Sign up for our Free Essentials Plan. 
CNVMBTPLK037 Could not determine state of the engines
Self-Explanatory Message Since SAP believes that this specific error message is 'self-explanatory,' no more information has been given.The majority of...
CNVMBTPLK036 Engine(s) successfully &1.
Self-Explanatory Message Since SAP believes that this specific error message is 'self-explanatory,' no more information has been given.The majority of...
CNVMBTPLK039 At least one of the importparameters must contain a value.
Self-Explanatory Message Since SAP believes that this specific error message is 'self-explanatory,' no more information has been given.The majority of...
CNVMBTPLK040 Product Lock is active and engine &1 is closed.
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.