diff --git a/lib/schedule_events.js b/lib/schedule_events.js
index 51bee5d3..520f3a7d 100644
--- a/lib/schedule_events.js
+++ b/lib/schedule_events.js
@@ -33,10 +33,10 @@ class ScheduleEvents {
 
   _putRule (params) {
     // return RuleArn if created
-    return new Promise((resolve) => {
+    return new Promise((resolve, reject) => {
       const _params = this._putRulePrams(params)
       this.cloudwatchevents.putRule(_params, (err, rule) => {
-        if (err) throw err
+        if (err) reject(err)
         resolve(rule)
       })
     })
@@ -53,11 +53,11 @@ class ScheduleEvents {
   }
 
   _addPermission (params) {
-    return new Promise((resolve) => {
+    return new Promise((resolve, reject) => {
       const _params = this._addPermissionParams(params)
       this.lambda.addPermission(_params, (err, data) => {
         if (err) {
-          if (err.code !== 'ResourceConflictException') throw err
+          if (err.code !== 'ResourceConflictException') reject(err)
           // If it exists it will result in an error but there is no problem.
           resolve('Permission already set')
         }
@@ -78,11 +78,11 @@ class ScheduleEvents {
   }
 
   _putTargets (params) {
-    return new Promise((resolve) => {
+    return new Promise((resolve, reject) => {
       const _params = this._putTargetsParams(params)
       this.cloudwatchevents.putTargets(_params, (err, data) => {
         // even if it is already registered, it will not be an error.
-        if (err) throw (err)
+        if (err) reject(err)
         resolve(data)
       })
     })
@@ -91,9 +91,9 @@ class ScheduleEvents {
   add (params) {
     return Promise.resolve().then(() => {
       return this._putRule(params)
-    }).then((rule) => {
+    }).then(rule => {
       return this._addPermission(Object.assign(params, rule))
-    }).then((data) => {
+    }).then(data => {
       return this._putTargets(params)
     })
   }