```\nfunction addValidators(\n uint256 \_operatorIndex,\n uint256 \_keyCount,\n bytes calldata \_publicKeys,\n bytes calldata \_signatures\n) external onlyActiveOperator(\_operatorIndex) {\n if (\_keyCount == 0) {\n revert InvalidArgument();\n }\n\n if (\_publicKeys.length % PUBLIC\_KEY\_LENGTH != 0 || \_publicKeys.length / PUBLIC\_KEY\_LENGTH != \_keyCount) {\n revert InvalidPublicKeys();\n }\n```\n