i had the same isshue. Replaced howler.min.js content with ‘howler.core.js’ and problem was fixed.
InvalidStateError: An attempt was made to use an object that is not, or is no longer, usable howler.min.js:2
pause ***howler.min.js:2:10497
e ***howler.min.js:4:9171
Howl.prototype.pos ***howler.min.js:4:3754
setPosition HTML5AudioSource.hx:307:78
play HTML5AudioSource.hx:72:2
play AudioSource.hx:71:2
openfl_media_SoundChannel SoundChannel.hx:107:3