having trouble with a formula, it won't add new input to the sub tabs

[cullenrevel]

I've been working on a formula to extract data from the master sheet on excel to sub sheets. I've got the formula to work but when I enter new teams on the master sheet, it's not extracting to the sub sheets properly. it creates a #number error. What am I doing wrong? Please look on the tyke.novice tab to see the problem i'm commenting on. =IF(ROWS($A$3:A5)>$J$1,"",INDEX([YHLRegistation]Master!A$2:A$19,SMALL(IF([YHLRegistation]Master!$B$2:$B15=$C$1,ROW([YHLRegistation]Master!$B$2:$B15)-ROW([YHLRegistation]Master!$B$2)+1,""),ROWS(A$3:A5)))) that is my formula.

[#2]

You are obviously referring to an external workbook. Thus, you must include the extension name in the workbook name, like this:
[YHLRegistation.xlsx]
If possible, avoid external references. Instead, refer to ranges in the same workbook, although in another worksheet.