Transaction

[Error Code: 1101] cadence runtime error Execution failed:
error: underflow
  --> 607728a8fa2a013871ce261fe11fa1bc19ffd0893fd0a8f32291cfe1e7ee2f3d:16:8
   |
16 |         let total: UFix64 = SwapConfig.ScaledUInt256ToUFix64(res) - 0.2
   |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^