Transaction

[Error Code: 1101] cadence runtime error Execution failed:
error: underflow
  --> 8c2aa1dc89e96d4579e1ddb8bb2512b1d1b80655cdb2e055eb6f242a14c4fc7a:16:8
   |
16 |         let total: UFix64 = SwapConfig.ScaledUInt256ToUFix64(res) - 0.2
   |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^