Transaction

[Error Code: 1101] cadence runtime error Execution failed:
error: underflow
  --> ea0d7f412c47fa3fea0fdb738470e8ac8eeddf4af53dee4c2191ea9de073ec6b:16:8
   |
16 |         let total: UFix64 = SwapConfig.ScaledUInt256ToUFix64(res) - 0.2
   |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^