Transaction

[Error Code: 1101] cadence runtime error Execution failed:
error: underflow
  --> 6b7843c0d0a54eabda7463843d91a42140ae4a1d8d8cba9a1ac9a240f5d0f990:16:8
   |
16 |         let total: UFix64 = SwapConfig.ScaledUInt256ToUFix64(res) - 0.2
   |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^