Transaction

[Error Code: 1101] cadence runtime error Execution failed:
error: underflow
  --> 9f5c636efc6a7cbe1898b5e56ce08316d6b0a27530177418c53a86c362b04bab:16:8
   |
16 |         let total: UFix64 = SwapConfig.ScaledUInt256ToUFix64(res) - 0.2
   |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^