1. Start by closing CSources completely, do not save in the editor.

2. Open Cydia, go to Sources and hit Refresh.

3. When Cydia is done refreshing sources, Close Cydia.

4. Open CSources again. Go back to this page.

5. In the above "cydia.list"  highlight ONLY the sources you added yourself.

NOT SOURCES ADDED THROUGH CYDIA

i.e. (More Package Sources)

Sources you added will look like:
deb http://SomeRepo.com/repo/ ./

6. Copy highlighted source, and paste into the Editor using the ( Edit ) button.

7. Once you copied all of the sources you added to Cydia, before installing CSources. Make sure you followed the basic rules listed on the Home page. Press Save in the Editor.

8. Now close CSources.

9. Open Cydia, Don't let Cydia refresh sources, CANCEL any refreshing.

10. Go to Sources, tap Edit, and remove all sources you added into CSources, with the ( - ). Doing this will ensure that no duplicate sources will be loaded when refreshing.

11. Your ready to go. After removing duplicate sources from Cydia, You can now hit the Refresh button. All Sources will refresh and sources in CSources will load as well.