I had this exact same issue with the same error as you did. Follow these steps EXACTLY, that's what I did and now it's working:
1) Turn on 3ds
2) Launch CN
3) Launch Brahma
4) Load the payload
5) Launch the payload
6) Select your version with the D-PAD
7) Start the CFW with START
8) Launch CN (again)
9) Launch FBI
10) Install BigBlueMenu
*credit to motezazer for providing the steps and writing out this guide*