I've never seen an error such as this before, and it does not show for me in my tests.
Also, if it was oxide the error report would always show the version number and have references of oxide its self in the report.
So this error log you show is not adding up.
Please note, i do not support rust-staging builds only release builds.
Current supported oxide release is
o.version
Oxide.Rust Version: 2.0.6143
Oxide.Rust Branch: master
Perhaps you have a mod installed that modifies console output or simply you don't have oxide installed but something else like carbon, etc.