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The Cisco Catalyst 6000/6500 Series switch receives the VLAN(s) not available in Port Manager error message when it attempts to create a VLAN
Layer 3 LAN ports, WAN interfaces and subinterfaces, and some software features use internal VLANs in the extended range. You cannot use an extended range VLAN that has been allocated for internal use.
The same VLAN cannot be recreated if it is used internally by the switch. Issue the show vlan internal usage command in order to check the internal status of a VLAN.
In order to resolve this issue, configure the internal VLAN allocation policy either in ascending or descending order, as shown: