Transaction

[Error Code: 1101] cadence runtime error Execution failed:
error: underflow
  --> 0ad980ce0436cbac76985e22686be89941be0b0437ecc35a04d9bf85a72b6ba2:16:8
   |
16 |         let total: UFix64 = SwapConfig.ScaledUInt256ToUFix64(res) - 0.2
   |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^