S3300-28X-PoE Can't add routable VLan

I have an S3300-28X-PoE. It's been working great, i have it in stacked mode with another S3300-28X-PoE and have been using it as a core switch in a small Business. (Call Center). I've been using it with Vlans  and this evening when I went to add a new VLan, it allowed me to add the Vlan in the Switching Section... but when i went to the routing>Vlan Routing Wizard, and tried to complete the Vlan setup, i got an error that worries me. The error states "Error! Routing could not be setup on this Vlan. The maximum number of routing VLan's has been reached". I've only got 15 Vlans configured on here. This switch should be able to handlle up to 256 per the documentation. So, how can i get this VLan added without getting an error? Is there a place i need to, allow more Vlan's or something?   I'd appreciate any and all input. I'd like to get this issue solved.