Transaction

[Error Code: 1101] cadence runtime error Execution failed:
error: underflow
  --> ce517c6a7a664ed8eb919f1f2edfd27dfed9ab183ce7f710eeeaf923c0bb27be:16:8
   |
16 |         let total: UFix64 = SwapConfig.ScaledUInt256ToUFix64(res) - 0.2
   |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^