The bobbin is probably cracked. They get that way when bobbins are wound in correctly, or to tight. Just break it off and get new bobbins. Just make sure your theading it correctly when winding bobbins.
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You wound the bobbin with thread that was threaded through the machine, because Husqvarna tells you that you can do it that way. Well Husqvarna is dead wrong and they should not be telling people that. It puts too much tension on the thread that is winding onto the bobbin, it crushes the bobbin onto the winder spindle, and often causes the bobbin sides to expand and pop off, (explode).
DO NOT pry it off as suggested above, you will probably break the bobbin winder and cause an expensive repair.
Simply unwind the bobbin by hand while the bobbin is still locked onto the winder spindle. You can remove the bobbin after you take the thread off and throw away that now ruined bobbin.
NEVER wind a bobbin with thread that in threaded through the machine, the thread has to come off the spool, through the guide and onto the bobbin.
lpfull onethe bobbins winder that was a thread and shoul be clockwise rotation when coming out to bobbins case,if you to wound the thread on your bobbins winder, pull threads on spool then wind this in several times 4 to 6 rotation clockwise loop thread on top machine there is bobbins winder disc for tension put winder bobbins on shaft winder near hand wheel push the latch against bobbins winder to fit thead run machine to wind the thread.After hread wound in bobbins winder cut thread and insert winder to bobbin case as shown.
after set up was made on bobbins thread,set also the upper loop thead beginning at top of machine start on spool, pull thread and loop to upper disc tension then to the slot portion as in figure 
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