update receive eth

contracts/Distribution.sol

@@ -37,6 +37,7 @@ contract Distribution is IDistribution, Ownable, Pausable, ReentrancyGuard {
         require(MerkleProof.verifyCalldata(proof, _merkleRoot(), leaf), "Invalid proof");
 
         uint256 userCanClaimAmount = userAllAmount - userClaimed[msg.sender];
+        require(userCanClaimAmount > 0, "Nothing to claim");
         userClaimed[msg.sender] = userAllAmount;
         transferToken(msg.sender, userCanClaimAmount);
         emit Claimed(msg.sender, userCanClaimAmount, userAllAmount);
@@ -54,4 +55,6 @@ contract Distribution is IDistribution, Ownable, Pausable, ReentrancyGuard {
     function claimedOf() public view returns (uint256){
         return userClaimed[msg.sender];
     }
+
+    receive() external payable{}
 }
\ No newline at end of file

hardhat.config.js

@@ -13,7 +13,7 @@ module.exports = {
   },
   networks: {
     testnet: {
-      url: 'https://dev.rpc.agicoin.ai',
+      url: 'https://dev.rpc.aonet.ai',
       accounts: process.env.PRIVATE_KEY ? [process.env.PRIVATE_KEY] : []
     }
   },