diff --git a/beacon-light-client/plonky2/input_fetchers/balance_verification/abi/validators_accumulator_abi.json b/beacon-light-client/plonky2/input_fetchers/balance_verification/abi/validators_accumulator_abi.json
index f210f7881..1950af76c 100644
--- a/beacon-light-client/plonky2/input_fetchers/balance_verification/abi/validators_accumulator_abi.json
+++ b/beacon-light-client/plonky2/input_fetchers/balance_verification/abi/validators_accumulator_abi.json
@@ -10,11 +10,6 @@
     "stateMutability": "nonpayable",
     "type": "constructor"
   },
-  {
-    "inputs": [],
-    "name": "InvalidCaller",
-    "type": "error"
-  },
   {
     "anonymous": false,
     "inputs": [
diff --git a/beacon-light-client/solidity/contracts/validators_accumulator/ValidatorsAccumulator.sol b/beacon-light-client/solidity/contracts/validators_accumulator/ValidatorsAccumulator.sol
index a697228dc..6859ad82c 100644
--- a/beacon-light-client/solidity/contracts/validators_accumulator/ValidatorsAccumulator.sol
+++ b/beacon-light-client/solidity/contracts/validators_accumulator/ValidatorsAccumulator.sol
@@ -152,18 +152,4 @@ contract ValidatorsAccumulator is IValidatorsAccumulator {
 
     return lower;
   }
-
-  function toLe64(uint64 value) internal pure returns (bytes memory ret) {
-    ret = new bytes(8);
-    bytes8 bytesValue = bytes8(value);
-    // Byteswapping during copying to bytes.
-    ret[0] = bytesValue[7];
-    ret[1] = bytesValue[6];
-    ret[2] = bytesValue[5];
-    ret[3] = bytesValue[4];
-    ret[4] = bytesValue[3];
-    ret[5] = bytesValue[2];
-    ret[6] = bytesValue[1];
-    ret[7] = bytesValue[0];
-  }
 }
diff --git a/beacon-light-client/solidity/contracts/validators_accumulator/interfaces/IValidatorsAccumulator.sol b/beacon-light-client/solidity/contracts/validators_accumulator/interfaces/IValidatorsAccumulator.sol
index 901dcf193..a885e299d 100644
--- a/beacon-light-client/solidity/contracts/validators_accumulator/interfaces/IValidatorsAccumulator.sol
+++ b/beacon-light-client/solidity/contracts/validators_accumulator/interfaces/IValidatorsAccumulator.sol
@@ -9,8 +9,6 @@ interface IValidatorsAccumulator {
 
   event Deposited(bytes pubkey);
 
-  error InvalidCaller();
-
   function getValidatorsAccumulator() external view returns (bytes32 node);
 
   function deposit(