I'm not sure this is the right place to report the issue, but in a PkgEval run over at JuliaLang/julia#43127 this package failed with the above message. That error, however, should be completely unrelated to the Julia PR, so maybe it came up due to randomized tests and is not always seen?
https://s3.amazonaws.com/julialang-reports/nanosoldier/pkgeval/by_hash/7d3df0d_vs_8197c41/SymbolicUtils.1.8.0-DEV-8d8c8fe49ce.log