Unable to diff catalogs - undefined method 'version'

[Peter Faller]

Even when trying to compare a minimal catalog ('node tstpuppet01.localdomain {}') to itself, I get an error:

# puppet master --environment trunk_9_4_0_0 --compile tstpuppet01.localdomain > /tmp/tstpuppet01.localdomain.new.pson

# puppet catalog diff --debug tstpuppet01.localdomain.new.pson tstpuppet01.localdomain.new.pson

Debug: Runtime environment: puppet_version=5.0.1, ruby_version=2.4.1, run_mode=user, default_encoding=UTF-8

Error: Add --debug for realtime output, add --render-as {json,yaml} for parsed output

Error: undefined method `version' for #<Hash:0x007fdd1d8966b8> <<<<--------------

Error: Try 'puppet help catalog diff' for usage

Is this a versioning issue, perhaps? I'm using:

[root@tstpuppet01 tmp]# puppet --version

5.0.1

[root@tstpuppet01 tmp]# puppet module list

/etc/puppetlabs/code/environments/production/modules (no modules installed)

/etc/puppetlabs/code/modules

├── crayfishx-firewalld (v3.3.2)

├── example42-network (v3.3.7)

├── herculesteam-augeasproviders_core (v2.1.3)

├── herculesteam-augeasproviders_ssh (v2.5.3)

├── puppetlabs-concat (v4.0.1)

├── puppetlabs-firewall (v1.9.0)

├── puppetlabs-limits (v0.1.0)

├── puppetlabs-ntp (v6.2.0)

├── puppetlabs-stdlib (v4.19.0)

└── zack-catalog_diff (v1.6.0)

/opt/puppetlabs/puppet/modules (no modules installed)

Anyone seen this?

- Peter