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Ethereum: Unknown selector error (0x98296c54) at Bigtokentest.t.sol

The latest popular smart contract testing system «Testbobbalance» has occurred in a repetition of an unexpected error. The specific problem is related to the «unknown selector» error that is activated by launching the test using the «Bigtokentest» contract.

Question: Unknown selector error (0x98296c54)

This unknown selector error occurs when trying to access the VMCalls feature in the TestBobbalance test. The error message «Unknown Selector 0x98296C54 VMCalls» states that there is a problem with how the functions of the contract are called.

Source Code: Bigtokentest.t.Sol

When checking the code, the «TestBobbalance» feature in Bigtokentest seems to contain a logical error. Specifically, the test attempts to call the VMCalls feature with an argument that is not defined in the current field of activity.

problematic code line

`SOLIDITY

Function TestBobbalance () Public {

// … (other code)

VMCalls (VB, 0x00000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000)

}

`

In this row, «VMCalls» is called with an argument for 0x000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000 «. However, the VMCALLS function is expected to have a special argument that is probably the value that is preserved in the current field of activity. In this case, it does not seem to have a certain argument for the VMCalls function.

Solution

To solve this problem, the test author seems to have ignored an important detail: the function of the contract «VMCALLS» requires concrete arguments to be issued during the functions of the function. In order to prevent this error, the correct argument should be made, which is probably the value preserved in the current field of activity.

Here is an updated version of the code fragment with the adjusted line:

`SOLIDITY

Function TestBobbalance () Public {

// … (other code)

VMCALLS (VB, 0x00000000000000000000000000000000000000000000000000000000000000, 0x000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000);

}

`

By adding the second argument, 0x00000000000000000000000000000000000000000000000000000000, we make sure that the correct value is transferred to the VMCALLS function, solving an unknown selector error.

Conclusion

«Unknown selector error (0x98296C54) VMCalls» TestBobbalance «is resolved by correcting a logical error in the contract code. Understanding the problem and introducing the necessary fix, developers can ensure that their smart contracts operate smoothly and consistently.

Note: The above article is based on hypothetical information and may not reflect the real -world scenarios or the actual Ethereum’s development practice. It is important to check any errors or problems with the working test environment before making changes to the production code.