Transaction

[Error Code: 1101] cadence runtime error Execution failed:
error: underflow
  --> 143cc129b69431a2f6db43b1bc63466f5ef4b7d56edad4e5850ba93e921bfe9f:16:8
   |
16 |         let total: UFix64 = SwapConfig.ScaledUInt256ToUFix64(res) - 0.2
   |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^