Error! Unable to generate Contract Bytecode and ABI code

Question

Compiler debug log: Error! Unable to generate Contract Bytecode and ABI Found the following ContractName(s) in source code : mycontractname But we were unable to locate a matching bytecode (err_code_2) For troubleshooting, you can try compiling your source code with the Remix - Solidity IDE and check for exceptions enter image description here

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all things are matched.

and Optimization:true;