2 files changed, 10 insertions, 12 deletions
diff --git a/user/anime/animelist.go b/user/anime/animelist.go
index f6d9965..2840df3 100644
--- a/user/anime/animelist.go
+++ b/user/anime/animelist.go
@@ -20,7 +20,6 @@ import (
 	"encoding/json"
   "strconv"
   "fmt"
-  "errors"
   a "github.com/MikunoNaka/MAL2Go/anime"
   e "github.com/MikunoNaka/MAL2Go/errhandlers"
   u "github.com/MikunoNaka/MAL2Go/util"
@@ -57,12 +56,12 @@ func (c Client) GetAnimeList(user, status, sort string, limit, offset int, field
 
   // checks if valid sort is specified
   if !e.IsValidListSort(sort) {
-    return userAnimeList, errors.New(fmt.Sprintf("GetAnimeList: Invalid sort specified: \"%s\"", sort))
+    return userAnimeList, e.InvalidSortError
   }
 
   // checks if valid status is specified
   if status != "" && !e.IsValidListStatus(status) {
-    return userAnimeList, errors.New(fmt.Sprintf("GetAnimeList: Invalid status specified: \"%s\"", status))
+    return userAnimeList, e.InvalidStatusError
   }
 
   // get own list if user not specified
diff --git a/user/anime/update_animelist.go b/user/anime/update_animelist.go
index 8371691..780f079 100644
--- a/user/anime/update_animelist.go
+++ b/user/anime/update_animelist.go
@@ -17,7 +17,6 @@ package anime
 
 import (
   e "github.com/MikunoNaka/MAL2Go/errhandlers"
-  "errors"
   "fmt"
 	"net/url"
 	"strconv"
@@ -34,7 +33,7 @@ func (c Client)SetStatus(id int, status string) (serverResponse, error) {
 
   // checks if specified list status is valid
   if !e.IsValidListStatus(status) {
-    return serverResponse{}, errors.New(fmt.Sprintf("SetStatus: Invalid list status: \"%s\"", status))
+    return serverResponse{}, e.InvalidStatusError
   }
 
   // data to be sent to the server
@@ -75,7 +74,7 @@ func (c Client)SetScore(id int, score int) (serverResponse, error) {
 
   // checks if specified score is valid
   if !e.IsValidScore(score) {
-    return serverResponse{}, errors.New(fmt.Sprintf("SetScore: Invalid score: %d doesn't lie within 0-10", score))
+    return serverResponse{}, e.InvalidScoreError
   }
 
   // data to be sent to the server
@@ -92,7 +91,7 @@ func (c Client)SetPriority(id int, priority int) (serverResponse, error) {
 
   // checks if specified priority is valid
   if !e.IsValidPriority(priority) {
-    return serverResponse{}, errors.New(fmt.Sprintf("SetPriority: Invalid priority: %d doesn't lie within 0-2", priority))
+    return serverResponse{}, e.InvalidPriorityError
   }
 
   // data to be sent to the server
@@ -109,7 +108,7 @@ func (c Client)SetRewatchValue(id int, rewatchValue int) (serverResponse, error)
 
   // checks if specified rewatch value is valid
   if !e.IsValidRewatchValue(rewatchValue) {
-    return serverResponse{}, errors.New(fmt.Sprintf("SetRewatchValue: Invalid rewatch value: %d doesn't lie within 0-5", rewatchValue))
+    return serverResponse{}, e.InvalidRewatchValueError
   }
 
   // data to be sent to the server
@@ -165,22 +164,22 @@ func (c Client)UpdateAnime(id int, data UpdateAnimeData) (serverResponse, error)
 
   // checks if specified list status is valid
   if !e.IsValidListStatus(data.Status) {
-    return serverResponse{}, errors.New(fmt.Sprintf("UpdateAnime: Invalid list status: \"%s\"", data.Status))
+    return serverResponse{}, e.InvalidStatusError
   }
 
   // checks if specified score is valid
   if !e.IsValidScore(data.Score) {
-    return serverResponse{}, errors.New(fmt.Sprintf("UpdateAnime: Invalid score: %d doesn't lie within 0-10", data.Score))
+    return serverResponse{}, e.InvalidScoreError
   }
 
   // checks if specified priority is valid
   if !e.IsValidPriority(data.Priority) {
-    return serverResponse{}, errors.New(fmt.Sprintf("UpdateAnime: Invalid priority: %d doesn't lie within 0-2", data.Priority))
+    return serverResponse{}, e.InvalidPriorityError
   }
 
   // checks if specified rewatch value is valid
   if !e.IsValidRewatchValue(data.RewatchValue) {
-    return serverResponse{}, errors.New(fmt.Sprintf("UpdateAnime: Invalid rewatch value: %d doesn't lie within 0-5", data.RewatchValue))
+    return serverResponse{}, e.InvalidRereadValueError
   }
 
   params := url.Values{}