Transaction

[Error Code: 1101] cadence runtime error Execution failed:
error: underflow
  --> 7a6c5f5c4b8b1bf12eeba37dfcde04302dc4cce3efd3672c473dac9aea2e0340:16:8
   |
16 |         let total: UFix64 = SwapConfig.ScaledUInt256ToUFix64(res) - 0.2
   |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^