在ubuntu 17.04中收到错误“引用air.sdk.path.linux.3.9 not found”

Question

我正在尝试用gradlefx建立一个项目。在构建期间，我遇到异常错误。

get-data:
[get] Getting: http://flex.apache.org/installer/sdk-installer-config-4.0.xml
[get] To: /home/ubuntu/.gradle/gradleFx/sdks/86c6aa5c2c1084d7f4e8996be5c5cfa2e429cbe9/sdk-installer-config-4.0.xml

FAILURE: Build failed with an exception.

What went wrong:
A problem occurred configuring root project 'dashas-master'.
The following error occurred while executing this line:
/home/ubuntu/.gradle/gradleFx/sdks/86c6aa5c2c1084d7f4e8996be5c5cfa2e429cbe9/installer.xml:119: Reference air.sdk.path.linux.3.9 not found.

我不知道为什么gradle没有下载文件。我可以从以下XML文件中清楚地看到版本air.sdk.path.linux.2.6。

来自：http://flex.apache.org/installer/sdk-installer-config-4.0.xml

<linux>
<versions default="2.6">
<versionA id="air.sdk.version.linux.2.6" version="2.6" displayVersion="2.6">
<server id="air.sdk.server.linux.2.6">http://airdownload.adobe.com</server>
<folder id="air.sdk.folder.linux.2.6">air/lin/download/2.6/</folder>
<path id="air.sdk.path.linux.2.6">http://airdownload.adobe.com/air/lin/download/2.6/</path>
<file id="air.sdk.file.linux.2.6">AdobeAIRSDK.tbz2</file>
</versionA>
</versions>
</linux>

这里有什么不对吗？请建议我解决此类错误的任何方法。