Build failed with exception error "Reference air.sdk.path.linux.3.9 not found: on Ubuntu 17.04

[vkp123]

I have tried to build the project on Ubuntu 17.04 . During the build process , I am getting following error .

ubuntu@ubuntu:~/Desktop/dashas-master$ gradle clean compile
Download http://dashas.castlabs.com/ivy/apache-flex-sdk-4.12.1.tar.gz
[copy] Copying 5682 files to /home/ubuntu/.gradle/gradleFx/sdks/86c6aa5c2c1084d7f4e8996be5c5cfa2e429cbe9
[copy] Copied 1034 empty directories to 144 empty directories under /home/ubuntu/.gradle/gradleFx/sdks/86c6aa5c2c1084d7f4e8996be5c5cfa2e429cbe9

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.

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How can i solve this issue ? Please Verify the same