WX2540H扩容License在设备上激活文件失败问题处理

给WX2540H扩容License，在设备上激活文件失败。

激活文件时提示如下信息：

[WX2540_2]license activation-file install flash:/210235A1JMC15A0000592017012010522084428.ak

This operation might take some time. Do not perform any other operations until the operation is completed or a failure message is displayed. Please wait...
The activation file cannot be parsed now.

核对现场导入的License文件2594字节无误，确认文件本身没有问题。

<WX2540_2>dir
Directory of flash:
   0 -rw-        2594 Jan 20 2017 12:27:27   210235A1JMC15A0000592017012010522084428.ak

查看License信息发现设备上已注册3个16步长的License。

[WX2540_2]dis license
flash:/license/attachmentname03
Feature: APMGR
Product Description: Enhanced Access Controller License,16 APs,for Verticals,for V7
Registered at: 2016-01-16 18:25:00
License Type: Permanent
Current State: In use

flash:/license/attachmentname02
Feature: APMGR
Product Description: Enhanced Access Controller License,16 APs,for Verticals,for V7
Registered at: 2016-01-16 18:24:54
License Type: Permanent
Current State: In use

flash:/license/attachmentname
Feature: APMGR
Product Description: Enhanced Access Controller License,16 APs,for Verticals,for V7
Registered at: 2016-01-16 18:24:48
License Type: Permanent
Current State: In use

WX2540H最大支持AP数48，步长16的License最多注册3个，现场已注册3个，因此不能再注册。