Multiple classification chapters found...

 
 
Error:
Multiple classification chapters found on level {0} by the name of '{1}.
 
Explanation:
Each classification layer below the first layer consists of several chapters:
 
 
All these chapters have a unique name in order to ensure optimal classification and search function. If several of the same chapters occur in the file, this will result in an error message.
 
Solution:
Find the duplicate names, determine which name needs to be changed and change it to the correct chapter name.