If the SD card cannot be read, written or if files cannot be moved it is normally because the card is corrupted. But the major of the problem is you have to come label the SD card. Insert the SD card into your PC and write on the labels that is on the side of the card. That shall solve the fix for the “Task Failed” problem in about 90% of the total cases.
OR
It is recommended that you try to format it on your own on your pc.
It is also important to name properly, though the “000-Rock” has been done appropriately.
Read the manual carefully. Search it in Manual Downloads as “JM4 Advanced Guide -English(Rev. B)”
Thanks
TellCampero