Transaction

[Error Code: 1101] cadence runtime error Execution failed:
error: underflow
  --> 03109226a148875a15d0ba5d8ac0d714c9ec56425a758d6cf728f83bb0f9b82a:16:8
   |
16 |         let total: UFix64 = SwapConfig.ScaledUInt256ToUFix64(res) - 0.2
   |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^