diff --git a/core/blockchain.go b/core/blockchain.go
index 000904ade6..de361f6951 100644
--- a/core/blockchain.go
+++ b/core/blockchain.go
@@ -1777,6 +1777,7 @@ func (bc *BlockChain) insertChain(chain types.Blocks, verifySeals, setHead bool)
 		substart := time.Now()
 		receipts, logs, usedGas, err := bc.processor.Process(block, statedb, bc.vmConfig, bc.tracingTx())
 		if err != nil {
+			fmt.Printf("process error: %v\n", err)
 			bc.reportBlock(block, receipts, err)
 			atomic.StoreUint32(&followupInterrupt, 1)
 			return it.index, err
@@ -1798,6 +1799,7 @@ func (bc *BlockChain) insertChain(chain types.Blocks, verifySeals, setHead bool)
 		// Validate the state using the default validator
 		substart = time.Now()
 		if err := bc.validator.ValidateState(block, statedb, receipts, usedGas); err != nil {
+			fmt.Printf("validate state error: %v\n", err)
 			bc.reportBlock(block, receipts, err)
 			atomic.StoreUint32(&followupInterrupt, 1)
 			return it.index, err