java.lang.NullPointerException: This exception has no message.

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java.lang.NullPointerException:
at main.kotlin.com.brsdextemp.WindowBuilder.updateProgressBar(Builders.kt:96)
at main.kotlin.com.brsdextemp.DownloadClient.updateProgressBar(DownloadClient.kt:134)
at main.kotlin.com.brsdextemp.DownloadClient$downloadFiles$1.run(DownloadClient.kt:80)
at java.lang.Thread.run(Thread.java:745)

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