Multiple Mercurial errors on Eclipse startup

[Rob Grieshaber]

I just installed MercurialEclipse 2.11.0.20210411 in Eclipse 2021-06, have Mercurial 5.8 installed, running Linux Mint 19.3. When I start Eclipse I get "Multiple Mercurial errors have occurred. Please check the error log view for details". Clicking the Details button shows:

 .Command line:  -y debuginstall

. Command line:  -y debuginstall

. Command line:  -y debuginstall

Running hg -y debuginstall gives me:

checking encoding (UTF-8)...

checking Python executable (/usr/bin/python3)

checking Python implementation (CPython)

checking Python version (3.6.9)

checking Python lib (/usr/lib/python3.6)...

checking Python security support (sni,tls1.0,tls1.1,tls1.2)

checking Rust extensions (missing)

checking Mercurial version (5.8)

checking Mercurial custom build (hg20.9f798c1b0d89)

checking module policy (c)

checking installed modules (/usr/local/lib/python3.6/dist-packages/mercurial)...

checking registered compression engines (bz2, bz2truncated, none, zlib, zstd)

checking available compression engines (bz2, bz2truncated, none, zlib, zstd)

checking available compression engines for wire protocol (zstd, zlib, bz2, none)

checking "re2" regexp engine (missing)

checking templates (/usr/local/lib/python3.6/dist-packages/mercurial/templates)...

checking default template (/usr/local/lib/python3.6/dist-packages/mercurial/templates/map-cmdline.default)

checking commit editor... (uex)

checking username (rob)

no problems detected

Running eclipse -y debuginstall gives me:

SLF4J: Failed to load class "org.slf4j.impl.StaticLoggerBinder".

SLF4J: Defaulting to no-operation (NOP) logger implementation

SLF4J: See http://www.slf4j.org/codes.html#StaticLoggerBinder for further details.

Not sure which is relevant, but it appears there's not a problem with the Mercurial installation. 

Any suggestions?

Thanks in advance.