diff --git a/liteflow-core/src/main/java/com/yomahub/liteflow/core/FlowExecutor.java b/liteflow-core/src/main/java/com/yomahub/liteflow/core/FlowExecutor.java
index 3d4b13950..c31ece721 100644
--- a/liteflow-core/src/main/java/com/yomahub/liteflow/core/FlowExecutor.java
+++ b/liteflow-core/src/main/java/com/yomahub/liteflow/core/FlowExecutor.java
@@ -306,7 +306,7 @@ public class FlowExecutor {
                                       Integer slotIndex, boolean isInnerChain) throws Exception {
         if (null == param) {
             //data slot is a ConcurrentHashMap, so null value will trigger NullPointerException
-            throw new NullParamException("data slot cann't accept null param");
+            throw new NullParamException("data slot can't accept null param");
         }
         return this.execute0(chainId, param, slotClazz, slotIndex, isInnerChain);
     }
@@ -369,7 +369,7 @@ public class FlowExecutor {
                                                              boolean isInnerChain) {
         if (null == param) {
             //data slot is a ConcurrentHashMap, so null value will trigger NullPointerException
-            throw new NullParamException("data slot cann't accept null param");
+            throw new NullParamException("data slot can't accept null param");
         }
         return execute2Resp0(chainId, param, slotClazz, slotIndex, isInnerChain);
     }
diff --git a/liteflow-core/src/main/java/com/yomahub/liteflow/entity/data/AbsSlot.java b/liteflow-core/src/main/java/com/yomahub/liteflow/entity/data/AbsSlot.java
index e2255e6a5..10684c759 100644
--- a/liteflow-core/src/main/java/com/yomahub/liteflow/entity/data/AbsSlot.java
+++ b/liteflow-core/src/main/java/com/yomahub/liteflow/entity/data/AbsSlot.java
@@ -59,7 +59,7 @@ public abstract class AbsSlot implements Slot {
 	public <T> void setInput(String nodeId,T t){
 		if (null == t) {
 			//data slot is a ConcurrentHashMap, so null value will trigger NullPointerException
-			throw new NullParamException("data slot cann't accept null param");
+			throw new NullParamException("data slot can't accept null param");
 		}
 		dataMap.put(NODE_INPUT_PREFIX + nodeId, t);
 	}
@@ -67,7 +67,7 @@ public abstract class AbsSlot implements Slot {
 	public <T> void setOutput(String nodeId,T t){
 		if (null == t) {
 			//data slot is a ConcurrentHashMap, so null value will trigger NullPointerException
-			throw new NullParamException("data slot cann't accept null param");
+			throw new NullParamException("data slot can't accept null param");
 		}
 		dataMap.put(NODE_OUTPUT_PREFIX + nodeId, t);
 	}