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This is the error code: enter image description here

Adoption.sol code: enter image description here

TestAdoption.sol code: enter image description here

I dont know how to solve this, it fails when i try to use this comand: "truffle test". Thanks.

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delete everything inside your build folder in your truffle root project. and then repeat

truffle compile
truffle migrate
truffle test

hope this help

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Which truffle version are you using? I had same issue and I was using v5.1.15, the latest version for now. And I try an old v5.1.10 and it works. It's due to a compilation OS-compatibility path issue. Here you can find an article about it: https://github.com/trufflesuite/truffle/issues/2834#issuecomment-588321875

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npm uninstall -g truffle

npm install -g truffle@5.1.10 (always got me back on track)

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uninstall and install truffle helped me!

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