when I run to the truffle test while showing the error
then I opened the safemath.sol on the vs code shows the error
what should I do now to fix the problem?
You are using an old compiler version that did not support checked arithmetic and unchecked blocks yet. They were only added in solc 0.8.0 and this message looks like it came from solc 0.5.16 (which has been the default in Truffle until recently). Please set the compiler version in your Truffle config.
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