The Error you pasted seems a bit unrelated to the description. The error shows that you are calling method isClaimed(uint256,uint256) with data=0x. Perhaps you are making a call somewhere to that method without providing input arguments?

It is difficult to say without seeing the rest of the code.

The Error you pasted seems a bit unrelated to the description. The error shows that you are calling method isClaimed(uint256,uint256) with data=0x. Perhaps you are making a call somewhere to that method without providing input arguments?

It is difficult to say without seeing the rest of the code.

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The exception provides you this link: https://links.ethers.org/v5-errors-CALL_EXCEPTION

This type of exception happens if you try to access a method that doesn't exist for a specific address. A very common case is that you try to access "the right method and the right address" but in the wrong network. Make sure you are only trying to call that contract method in the chain where it is deployed.