Message type: E = Error
Message class:  CTS_ORGANIZER_MSG - Message Class for the Transport Organizer 
Message number: 268
Message text: Select a project
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 CTS_ORGANIZER_MSG268 ("Select a project") typically occurs in the context of the Change and Transport System (CTS) when you are trying to perform an action that requires a project to be selected, but no project has been specified.
Cause:
No Project Selected: The most common cause of this error is that the user has not selected a transport project in the CTS Organizer.
Authorization Issues: In some cases, the user may not have the necessary authorizations to view or select projects.
System Configuration: There may be issues with the configuration of the CTS or the transport landscape.
Solution:
Select a Project: 
Navigate to the CTS Organizer (transaction code SE09 or SE10).
Ensure that you have selected a transport project from the list. If no projects are listed, you may need to create a new transport project or check if you have the necessary authorizations to view existing projects.
Check Authorizations:
Ensure that your user role has Get instant SAP help. Sign up for our Free Essentials Plan.
Get instant SAP help. Sign up for our Free Essentials Plan. 
CTS_ORGANIZER_MSG267 During search &1 projects were found
Self-Explanatory Message Since SAP believes that this specific error message is 'self-explanatory,' no more information has been given.The majority of...
CTS_ORGANIZER_MSG266 During search &1 project was found
Self-Explanatory Message Since SAP believes that this specific error message is 'self-explanatory,' no more information has been given.The majority of...
CTS_ORGANIZER_MSG269 During search &1 team member was found
Self-Explanatory Message Since SAP believes that this specific error message is 'self-explanatory,' no more information has been given.The majority of...
CTS_ORGANIZER_MSG270 During search &1 team members were found
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.