why it says `Can't find FULLTEXT index matching the column list`, when i do have the index

[hollow arch]

the attachment shows my code. I'm trying to search a string array type column, but want to exclude docs that have a specific text, using the notEqual method. I've created a fullText type index with both of the columns included (the second attachment shows my index). but it still throws an error in the console saying Server Error. when I checked the container logs, I found Can't find FULLTEXT index matching the column list. don't know what's happening

[hearty cape]

Did you create a full text index on betDigitArray?

[hollow arch]

as the 2nd attachment shows, i created a fullText index with both betDigitArray and betType

[hearty cape]

would you please create 1 full text index with only betDigitArray?

[hollow arch]

1 fullText index with betDigitArray & 1 key index with betType?