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java.lang.IllegalArgumentException: Number must be defined.	at com.felkertech.cumulustv.plugins.CumulusChannel$Builder.build(CumulusChannel.java:248)	at com.felkertech.cumulustv.model.JsonChannel$Builder.build(JsonChannel.java:176)	at com.felkertech.cumulustv.fileio.M3uParser$M3uTvChannel.toJsonChannel(M3uParser.java:211)	at com.felkertech.cumulustv.fileio.M3uParser$M3uTvChannel.toString(M3uParser.java:216)	at com.felkertech.cumulustv.fileio.M3uParser$TvListing.toString(M3uParser.java:172)	at com.felkertech.cumulustv.fileio.M3uParser.parse(M3uParser.java:140)	at com.felkertech.cumulustv.activities.FileIoTestActivity.parse(FileIoTestActivity.java:152)	at com.felkertech.cumulustv.activities.FileIoTestActivity.access$100(FileIoTestActivity.java:38)	at com.felkertech.cumulustv.activities.FileIoTestActivity$2$3.onFileLoaded(FileIoTestActivity.java:135)	at com.felkertech.cumulustv.fileio.HttpFileParser$DownloadWebpageTask.doInBackground(HttpFileParser.java:34)	at com.felkertech.cumulustv.fileio.HttpFileParser$DownloadWebpageTask.doInBackground(HttpFileParser.java:27)	at android.os.AsyncTask$2.call(AsyncTask.java:304)	at java.util.concurrent.FutureTask.run(FutureTask.java:237)	at android.os.AsyncTask$SerialExecutor$1.run(AsyncTask.java:243)	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1133)	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:607)	at java.lang.Thread.run(Thread.java:761)