system
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It seems that you are using an outdated version of this app (latest is 5.2.0).
I have the same problem, avast! is saying that BeautifulWidgets (5.2) is a trojan known as Android:Xybot-E[Trj].
I have uploaded the app on VirusTotal and all the results are clean.
If someone of the administration @avast! is reading this… please fix it in the next signatures release.
Thank you!