The code lines seem to be fine (you show only the first four rows) and the gecko code is activated, so that is not the issue here. Super Mario 64 - Super Smash Bros. Mario Kart 64 - Zelda 64 - Patreon - Discord.
Yes, it's possible!Here is a package which contain everything needed:The code you have is encrypted because it's like XXXX-XXXX-XXXX. You need to decrypt it with GCNcrypt, then it should look like XXXXXXXX XXXXXXXX. The next step is to convert the code to ocarina using ARtoWIIRD.
Paste the decrypted codes from GCNcrypt into ARtoWIIRD and click convert codetypes. The code will nearly look like before but there are some modifications done. Then you need to pack it into a GCT using codemgr. Start it, press add code/comment/category, enter the code name, select the code in the list and then copy the converted codes from ARtoWIIRD into the code contents, press store modifications, enter the game ID and press store name/ID.
Paper Mario The Thousand Year Door Gecko Codes 2017
Then tick the code you created, press export to GCT, say yes, store to file and save it with the filename gameID.gct, for Paper Mario: The Thousand-Year Door the correct filename would be G8ME01.gct. Then you should be able to use this file in neogamma.