changes as per feedback

src/sdk/errorHandler/constants.ts

@@ -3,7 +3,7 @@ export const errorMsg = {
     '-32500': `Please make sure you have enough funds for wallet creation.`, // transaction rejected by entryPoint's simulateValidation, during wallet creation or validation
     '-32501': `Check paymaster data`,  // transaction rejected by paymaster's validatePaymasterUserOp
     '-32502': 'Try with another bundler', //transaction rejected because of opcode validation
-    '-32503': 'Try with valid validUntil and validAfter values', // UserOperation out of time-range
+    '-32503': 'validUntil and validAfter cannot be past timestamps', // UserOperation out of time-range
     '-32504': 'Try changing the bundler which accepts this paymaster', // transaction rejected because paymaster (or signature aggregator) is throttled/banned
     '-32505': 'Paymaster not staked or unstake-delay is too low. Try with another paymaster', // transaction rejected because paymaster (or signature aggregator) stake or unstake-delay is too low
     '-32506': null, // transaction rejected because wallet specified unsupported signature aggregator