Update error message pwn phone nexus 5 legacy unable to retrieve current version.

[Struck88]

Unable to update pwn phone nexus 5 to current version receive msg- An error occurred while installing rake ( 12.3.1) and bundler cannot continue . Error occurred executing line 517 with status code 1. Any suggestions would be greatly appreciated
Gmail - Transcript from Terminal Emulator for Android - root@localhost: /opt/pwnix/captures.pdf