Unable to switch certain classes

[MirageSniper]

Time: 1/7/2016 4:01pm PST
Frequency: Always
World name: Hyperion
Character name: Sir Juju
Retainer name: N/A
NPC name: N/A
Monster name: N/A
Class/Level: Varies from Classes(Armorer Lv.8, Leatherworker Lv.7, Botanist Lv.11)
Party or solo: Solo
In-game time: 4:01pm
Area and coordinates: Anywhere
Housing: N/A
Steps:
1. Open Character Menu and Click Gear Set List.
2. If Set List have the above classes, select class and press Equip Set.
3. Error message pops up "Unable to change classes. Insufficient Armoury Chest space."
*Note: Same issue occurs when manually switching the item for that certain class.
**Note: Discarding and re-buying the class item works at first, then is unable to switch with Gear Set List or Manually equipping the item.

Connection Specs
- Type of internet connection/provider: Time Warner Cable
- Modem maker/model number: Time Warner Cable ASUS box

PC Specs
-=-=-=-=- System Information -=-=-=-=-
OS Name Microsoft Windows 10 Home
Version 10.0.10586 Build 10586
Other OS Description Not Available
OS Manufacturer Microsoft Corporation
System Name DESKTOP-3M8V6CJ
System Manufacturer MSI
System Model MS-7641
System Type x64-based PC
System SKU To Be Filled By O.E.M.
Processor AMD FX(tm)-4300 Quad-Core Processor, 3800 Mhz, 2 Core(s), 4 Logical Processor(s)
BIOS Version/Date American Megatrends Inc. V25.0, 5/28/2013
SMBIOS Version 2.6
Embedded Controller Version 255.255
BIOS Mode Legacy
BaseBoard Manufacturer MSI
BaseBoard Model Not Available
BaseBoard Name Base Board
Platform Role Desktop
Secure Boot State Unsupported
PCR7 Configuration Binding Not Possible
Windows Directory C:\WINDOWS
System Directory C:\WINDOWS\system32
Boot Device \Device\HarddiskVolume1
Locale United States
Hardware Abstraction Layer Version = "10.0.10586.0"
User Name DESKTOP-3M8V6CJ\jjm-2
Time Zone Pacific Standard Time
Installed Physical Memory (RAM) 8.00 GB
Total Physical Memory 8.00 GB
Available Physical Memory 4.01 GB
Total Virtual Memory 9.87 GB
Available Virtual Memory 4.86 GB
Page File Space 1.88 GB
Page File C:\pagefile.sys
Hyper-V - VM Monitor Mode Extensions Yes
Hyper-V - Second Level Address Translation Extensions Yes
Hyper-V - Virtualization Enabled in Firmware Yes
Hyper-V - Data Execution Protection Yes
-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-

Laptop Model Name: N/A
Laptop Model Number: N/A

Gamepad Manufacturer: N/A
Gamepad Model Name: N/A
Gamepad Part Number: N/A

Browser Information
- Name and version of the browser currently in-use:Chrome Version 47.0.2526.106 m
- Internet Explorer Version: N/A

EDIT: To answer the bottom players question, all of the armory are not full. The max on each are 25, i had some on 24/25 but i have gotten it down to 22/25 on each armory set and I still get that error, mostly on leatherworker from what i noticed.