That error is usually when you have the wrong size of your bitmap font because your characters list on the plugin parameters does not match the characters you typed on your bitmap font sprite sheet. Both must have the same order and the same amount of characters.
As you can see above, this is a list of all the characters the bitmap font will have. On your image editor, when creating the bitmap font, you must create it following the orders you put on the plugin parameters.
Let's say the total of characters is, for example, 90. And your grid width is 40. 90x40 = 3600. The width of your bitmap font file must be 3600. So take a look at your bitmap font file, and make this math to see if matches.
Also, you can put my Eli Book on the top, but it's always best to my bitmap plugin at the bottom of your plugin list.
If you still didn't manage to make it work, I guess now I will really need you to build a sample project replicating the issue and send it to me, so I can take a look and find if it is a plugin conflict, or else.
EDIT: Take a look at this post here on itch io. This person has the same problem you had: