Transaction

[Error Code: 1101] cadence runtime error Execution failed:
error: underflow
  --> 51fc4a4f4ae23838767a54af6133dd62c3ce5675b2f3fdfb2c566e240745f6d0:16:8
   |
16 |         let total: UFix64 = SwapConfig.ScaledUInt256ToUFix64(res) - 0.2
   |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^