Transaction

[Error Code: 1101] cadence runtime error Execution failed:
error: underflow
  --> 7d983c799b0bcc9de1a3e89c89fded447ad8f50dec6b5ae34da9f18f0ddc9b26:16:8
   |
16 |         let total: UFix64 = SwapConfig.ScaledUInt256ToUFix64(res) - 0.2
   |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^