diff --git a/main.c b/main.c
index 25ad8d6..b958f01 100644
--- a/main.c
+++ b/main.c
@@ -89,7 +89,7 @@ static void export_book(const char path[], Book* book) {
     do {
         EB_Error_Code error;
         if ((error = eb_initialize_library()) != EB_SUCCESS) {
-            strcpy(book->error, eb_error_message(error));
+            fprintf(stderr, "Failed to initialize library: %s\n", eb_error_message(error));
             break;
         }
 
@@ -97,7 +97,7 @@ static void export_book(const char path[], Book* book) {
         eb_initialize_book(&eb_book);
 
         if ((error = eb_bind(&eb_book, path)) != EB_SUCCESS) {
-            strcpy(book->error, eb_error_message(error));
+            fprintf(stderr, "Failed to bind book: %s\n", eb_error_message(error));
             eb_finalize_book(&eb_book);
             eb_finalize_library();
             break;
@@ -146,13 +146,13 @@ static void export_book(const char path[], Book* book) {
                         export_subbook(&eb_book, subbook);
                     }
                     else {
-                        strcpy(subbook->error, eb_error_message(error));
+                        fprintf(stderr, "Failed to set subbook: %s\n", eb_error_message(error));
                     }
                 }
             }
         }
         else {
-            strcpy(book->error, eb_error_message(error));
+            fprintf(stderr, "Failed to get subbook list: %s\n", eb_error_message(error));
         }
 
         eb_finalize_book(&eb_book);
diff --git a/util.c b/util.c
index a57c429..1014b2a 100644
--- a/util.c
+++ b/util.c
@@ -100,10 +100,6 @@ static void encode_subbook(Subbook* subbook, json_t* subbook_json) {
         json_object_set_new(subbook_json, "copyright", json_string(subbook->copyright));
     }
 
-    if (strlen(subbook->error) > 0) {
-        json_object_set_new(subbook_json, "error", json_string(subbook->error));
-    }
-
     json_t* entry_json_array = json_array();
     for (int i = 0; i < subbook->entry_count; ++i) {
         json_t* entry_json = json_object();
@@ -120,10 +116,6 @@ static void encode_book(Book* book, json_t* book_json) {
     json_object_set_new(book_json, "characterCode", json_string(book->character_code));
     json_object_set_new(book_json, "discCode", json_string(book->disc_code));
 
-    if (strlen(book->error) > 0) {
-        json_object_set_new(book_json, "error", json_string(book->error));
-    }
-
     json_t* subbook_json_array = json_array();
     for (int i = 0; i < book->subbook_count; ++i) {
         json_t* subbook_json = json_object();
diff --git a/util.h b/util.h
index 83f7f07..dc43ba9 100644
--- a/util.h
+++ b/util.h
@@ -48,8 +48,6 @@ typedef struct {
     Entry* entries;
     int    entry_count;
     int    entry_cap;
-
-    char error[MAX_ERROR];
 } Subbook;
 
 typedef struct {
@@ -58,8 +56,6 @@ typedef struct {
 
     Subbook* subbooks;
     int      subbook_count;
-
-    char error[MAX_ERROR];
 } Book;
 
 /*