Transaction

[Error Code: 1101] cadence runtime error Execution failed:
error: underflow
  --> 3eaa2cf4072b99d8bbb3f5ee9881c875c987b1f146a66ea7ffd0ee276c297a72:16:8
   |
16 |         let total: UFix64 = SwapConfig.ScaledUInt256ToUFix64(res) - 0.2
   |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^