Adjust RPCTypeCheckObj error string

test/functional/wallet_send.py

@@ -362,7 +362,7 @@ class WalletSendTest(BitcoinTestFramework):
         for mode in ["economical", "conservative"]:
             for k, v in {"string": "true", "bool": True, "object": {"foo": "bar"}}.items():
                 self.test_send(from_wallet=w0, to_wallet=w1, amount=1, conf_target=v, estimate_mode=mode,
-                    expect_error=(-3, f"Expected type number for conf_target, got {k}"))
+                    expect_error=(-3, f"JSON value of type {k} for field conf_target is not of expected type number"))
 
         # Test setting explicit fee rate just below the minimum of 1 sat/vB.
         self.log.info("Explicit fee rate raises RPC error 'fee rate too low' if fee_rate of 0.99999999 is passed")