My App crashes when I try to print some byte-array content using

list.do: print "0x$(%02x it)"

Decoding by `jag`, device has version <2.0.0-alpha.146>
******************************************************************************
Class 'Null_' does not have any method 'class-name-for'.
  0: Instance.stringify        D:\a\toit\toit\tools\mirror.toit:98:27
  1: List.stringify.<block>    <sdk>\core\collections.toit:517:28
  2: SmallInteger_.repeat      <sdk>\core\numbers.toit:1224:3
  3: List.stringify            <sdk>\core\collections.toit:515:10
  4: Array.stringify           D:\a\toit\toit\tools\mirror.toit:113:37
  5: simple-interpolate-strings_ <sdk>\core\utils.toit:252:25
  6: Error.lookup-failure-stringify D:\a\toit\toit\tools\mirror.toit:167:14
  7: Error.stringify           D:\a\toit\toit\tools\mirror.toit:281:40
  8: handle-system-message     D:\a\toit\toit\tools\system_message.toit:51:28
  9: decode-system-message     D:\a\toit\toit\tools\system_message.toit:89:3
 10: main.<lambda>             D:\a\toit\toit\tools\system_message.toit:75:16
 11: Command.run               <pkg:pkg-cli>\cli.toit:186:34
 12: main                      D:\a\toit\toit\tools\system_message.toit:76:11
jag decode WyNVBVVYU1UQdjIuMC4wLWFscGhhLjE0NlNVAFskVSNVEGSFUyl6zVFVgQRjaNGCFctbI1UEVUVTVQ1MT09LVVBfRkFJTEVEWyNsAAAAA1VBVQNbI1UDSQHgVRZbI2wAAAACVUlVFlsjVQJVU1sjVRdbI2wAAAADVUZVAGwAAMW0WyNsAAAAA1VGVQFJHdlbI2wAAAADVUZVAkkd8FsjbAAAAANVRlUDSR2eWyNsAAAAA1VGVQRsAADGBlsjbAAAAANV
RlUFbAAAxHlbI2wAAAADVUZVBmwAALr1WyNsAAAAA1VGVQdsAADGRFsjbAAAAANVRlUISRNHWyNsAAAAA1VGVQlJHdlbI2wAAAADVUZVCkkd8FsjbAAAAANVRlULSR2eWyNsAAAAA1VGVQxJE3FbI2wAAAADVUZVDUkTjlsjbAAAAANVRlUOSQYpWyNsAAAAA1VGVQ9JHFpbI2wAAAADVUZVEEkd2VsjbAAAAANVRlURSR3wWyNsAAAAA1VGVRJsAACAuFsjbAAAAAN
VRlUTbAAAgNBbI2wAAAADVUZVFEl/9FsjbAAAAANVRlUVbAAAgHxbI2wAAAADVUZVFkkccw==
jag: Failed to decode line.
******************************************************************************

It's a null-pointer exception in the code that tries to decode the error. I think you only get the exception if you don't have the snapshot (but I could be wrong). Once fixed the error is:

Lookup failed message:[480, 22, instance of class 22].