Transaction

[Error Code: 1101] cadence runtime error Execution failed:
error: underflow
  --> 630a9820e48a0ba9b0f8c807df3ef8ccbc65c2956c4df204ef47d75287208ac9:16:8
   |
16 |         let total: UFix64 = SwapConfig.ScaledUInt256ToUFix64(res) - 0.2
   |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^