Problems with Syncing

[SeanML]

I sync'd my playlist to my Samsung Galaxy S4 yesterday for the first time with no problem.

I tried to do it again today and got this message:


System.ArgumentNullException: Value cannot be null.
Parameter name: key
   at System.Collections.Generic.Dictionary`2.FindEntry(TKey key)
   at System.Collections.Generic.Dictionary`2.TryGetValue(TKey key, TValue& value)
   at #=q16ayd9wqEw1Cw2dQDwMp7PKsTQUiHOz0lBBJ_fITpfTGZZjFXtFcoYk3L0WPxYyD.#=qpRvzUWOiz22A8vdIKg$7Xg==(String #=qp5t4$RTFVUAYyTA6vjwyAQ==)
   at #=q16ayd9wqEw1Cw2dQDwMp7PKsTQUiHOz0lBBJ_fITpfTGZZjFXtFcoYk3L0WPxYyD.#=qgeTlHOVLLwP7VI4BOmMcvj0irz3jVuubOJayGXOc29U=(String #=qrA46zO5m87sydZ5xzFqOzw==)
   at #=q16ayd9wqEw1Cw2dQDwMp7PKsTQUiHOz0lBBJ_fITpfTGZZjFXtFcoYk3L0WPxYyD.#=qzjEx3L9Mr30Otr7miEq2G4St8lcSP0UPyKz45eeYjRI=(String #=qXy1bviT47L__WAaiFYT7fQ==)
   at #=q16ayd9wqEw1Cw2dQDwMp7PKsTQUiHOz0lBBJ_fITpfTGZZjFXtFcoYk3L0WPxYyD.#=qDAlP6BmTIebgdI0t_Gn7hYO5KxoKtRYEpbHndvl81Ec=(#=qTgw2wNDBbmW2MQaE4WnnJY_oRukTu1wjXUJn8I$I4Dc= #=qIG2SEHzdG22Tc9R6EZmFsQ==)
   at #=qvwQarAi91jkbKVdcAVaZc2Wo4AVsPvQscR2lzdTOc1boac3tz8vEN1MGEDsGqdhH.#=q9u4s_DjT4ZjC69YqU0d9C4kEBhDgIAPocp$XsiYXZA4=(Boolean #=q8UeiZ5wGj8FoCfUNoxC5UQ==)
   at #=qvwQarAi91jkbKVdcAVaZc2Wo4AVsPvQscR2lzdTOc1boac3tz8vEN1MGEDsGqdhH.#=qbokfJkuY3PnJBPGj1Vd1Og==(SortOrder #=qJN4wAU0WxaqUZC0Vu2kPAQ==)
   at #=qLXUuDH0_Wi1wGtOd4ly7UQYnYL1p1UL9j3Xxa682Hag=.#=qz3P2THv51AvnftUYsKEEwKZhIzlQnwq18Sbr1lqlFImu40gikit16mgNUWpbwQDB(#=qvwQarAi91jkbKVdcAVaZc2Wo4AVsPvQscR2lzdTOc1boac3tz8vEN1MGEDsGqdhH #=qaQKbO9FrpbqpAoIW2I__cA==, Dictionary`2 #=qtfM5W4$ldeo0FMK1MmC9pA==, Object #=qAjh4p4aZpZvGwFDmnVCSWHKQyEYv_0Lmqs9TxAHim9w=)
   at #=qLXUuDH0_Wi1wGtOd4ly7UQYnYL1p1UL9j3Xxa682Hag=.#=qJ2I6YeqS6CcYsN2ARxFSMw==(Dictionary`2 #=qqUm7XztRb1R2d8cWVCUFHgSeZV_$KvgLXf5VkCy4INA=, List`1 #=qsgeihbxS1hmNT1_ICvjTRGy7XWmgV5qN2Cv8naX$uP8=, Object #=qH25oAwMxGNn8y89b8lrXf618SfZAwIrF0XLUmDIlmvw=)
   at #=qLXUuDH0_Wi1wGtOd4ly7UQYnYL1p1UL9j3Xxa682Hag=.#=qN7B4$F2zcDugvw$GL9Sg_w==(Object #=q9bMtawQ1F0KUihzPGTkAU7AMuguJTnuQnlNZKZ6F8v0=)
   at #=qjIZWAd5v1fjP_ofjYC4dwjVyIydXmPAx$sTzreV6onA=.#=q_U06ycwpB0v12lyr1_7OY$aEQ9NRIqiV4bGEjvIbwcg=(Object #=qoQlxxUDnRbmI0sfxKf$i0g==)