Transaction

[Error Code: 1101] cadence runtime error Execution failed:
error: underflow
  --> a8ffede87c812f213b02421b910941c547c0be4a2c94c1897107227709f51c0a:16:8
   |
16 |         let total: UFix64 = SwapConfig.ScaledUInt256ToUFix64(res) - 0.2
   |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^