Error "Index was outside the bounds of the array" when importing return package in SDL Trados Studio

When importing a return package in SDL Trados Studio the following error message displays:

 Index was outside the bounds of the array.

Workaround: Alter the *.sdlproj file of the return package

1. Edit the file extension of the return package and add .zip at the end of the .sdlrpx file and unzip the archive resulted from this.
2. Find the *.sdlproj file and open it in an Text/XML editor e.g. in Notepad++
3. Press the keyboard shortcut [Ctrl]+[F] to open the search dialog.
4. Search for the following: CountData
5. If you find duplicates delete the first row e.g.
   
   
    
6. Do this for every duplicate that you find
7. Copy+Paste the fixed *.sdlproj file in the archive that you extracted from. 
8. Rename the *.zip extension back to *.sdlrpx
9. Import/Open the return package in SDL Trados Studio. 

Fuzzy match count data in the return package is duplicated.
This is a known issue that was forwarded to our Development. Until a permanent fix is available follow the steps in the Resolution section for a workaround.

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• Unable to import return package - Index was outside the bounds of the array error message