Transaction

[Error Code: 1101] cadence runtime error Execution failed:
error: underflow
  --> 9869aed9c0cdf0e9282b072db0376df737d7b9ea80e5dfd9289fd43db4ff0dbd:16:8
   |
16 |         let total: UFix64 = SwapConfig.ScaledUInt256ToUFix64(res) - 0.2
   |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^