MDL-49262 removed the YUI versions of the bootstrap plugins. The thirpartylibs.xml file in the bootstrapbase theme was not updated when they were removed:

Processing /Applications/MAMP/htdocs/moodle29/theme/bootstrapbase/thirdpartylibs.xml for exclussions, incorrect /theme/bootstrapbase/yui/src/bootstrap/js/bootstrapcollapse.js path found. Please fix it

line 216 of /local/codechecker/locallib.php: call to debugging()
line 71 of /local/codechecker/index.php: call to local_codesniffer_get_ignores()

Processing /Applications/MAMP/htdocs/moodle29/theme/bootstrapbase/thirdpartylibs.xml for exclussions, incorrect /theme/bootstrapbase/yui/src/bootstrap/js/bootstrapdropdown.js path found. Please fix it

line 216 of /local/codechecker/locallib.php: call to debugging()
line 71 of /local/codechecker/index.php: call to local_codesniffer_get_ignores()

Processing /Applications/MAMP/htdocs/moodle29/theme/bootstrapbase/thirdpartylibs.xml for exclussions, incorrect /theme/bootstrapbase/yui/src/bootstrap/js/bootstrapengine.js path found. Please fix it

line 216 of /local/codechecker/locallib.php: call to debugging()
line 71 of /local/codechecker/index.php: call to local_codesniffer_get_ignores()

To reporoduce, install local_codechecker and run it anywhere on the moodle code base.