[Users] Problem with Spell Checker

[Gerard E. Seibert]

Operating System: FreeBSD 11.3
KDE Plasma Version: 5.17.4
KDE Frameworks Version: 5.64.0
Qt Version: 5.13.2
Kernel Version: 11.3-RELEASE-p5
OS Type: 64-bit
Processors: 4 × ACPI CPU
Memory: 31.7 GiB of RAM

System Information
GTK+ 2.24.32 / GLib 2.56.3
Locale: en_US.US-ASCII (charset: ISO-8859-1)
Operating System: FreeBSD 11.3-RELEASE-p5 (amd64)

Claws Mail 3.17.4

Under <Configuration> / <Preferences> / <Spell Checking>, I have set
the default dictionary to "en-US". Now, when I attempt to compose a
message, this error message pops up:

The spell checker could not change dictionary.
Couldn't initialize None dictionary:
(null)

The "Spell Checker" appears to be working correctly, however.

I am just trying to figure out what is happening here and why.

-- 
Jerry