Transaction

[Error Code: 1101] cadence runtime error Execution failed:
error: underflow
  --> 3c3fef6ec908a1a2f881e4c22fbbd3418fe62b2ee067b864f3390acf3a6ee3e2:16:8
   |
16 |         let total: UFix64 = SwapConfig.ScaledUInt256ToUFix64(res) - 0.2
   |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^