Transaction

[Error Code: 1101] cadence runtime error Execution failed:
error: underflow
  --> 9bcdb46ff38a3ea66c6b6de54251b099ac4f273e5f6dac6894b5bc409754d4c2:15:8
   |
15 |         let total: UFix64 = SwapConfig.ScaledUInt256ToUFix64(res) - 0.2
   |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^