Transaction

[Error Code: 1101] cadence runtime error Execution failed:
error: underflow
  --> 042eb64b83cd0b97df8f8e280fec3b40f9abc38b5b9d97c536b2c2873ba04cba:16:8
   |
16 |         let total: UFix64 = SwapConfig.ScaledUInt256ToUFix64(res) - 0.2
   |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^