There is no $log variable specified before call

[trk]

You can use wire()->log->warning().

CacheNesting/CacheNesting.module

Line 215 in 9f58d32

$log->warning("failed deleting cache: $depName");

CacheNesting/CacheNesting.module

Line 268 in 9f58d32

$this->log->error("The CacheNestedDependency module failed saving the cache dependency tree!");

[janKir]

Thanks! I changed both lines.

[kixe]

If you make changes to the module it is recommended to increment the version number to see always the last version in the modules directory (updated regularly) of ProcessWire. In the modules info array you maybe want to set your forum name:
'author' => 'JohnK'
which makes it easier for ProcessWire forum members to get in touch with you. A link to your personal modules directory will be provided too.

[janKir]

Thanks for this info. Updated the meta, as well.