I ran into a similar problem. I made the ANDROID_SWT point swt.jar located in the android sdk folder and it worked.
Steps:
i) Find the location of swt.jar. In the SDK folder, do
find . -name swt.jar
b) And export its path to the ANDROID_SWT environment variable.
export ANDROID_SWT= <path from step 1>
In my case, it worked:
export ANDROID_SWT=${ANDROID_SDK}/tools/lib/x86_64/
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