Transaction

[Error Code: 1101] cadence runtime error Execution failed:
error: underflow
  --> 510862a367e5eabd1b674940c2a3da0598bdd8fb4c46baa6523cbe165f5f9e47:15:8
   |
15 |         let total: UFix64 = SwapConfig.ScaledUInt256ToUFix64(res) - 0.2
   |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^