diff --git a/res/values-en/strings.xml b/res/values-en/strings.xml
index 415f1be..4dd6545 100644
--- a/res/values-en/strings.xml
+++ b/res/values-en/strings.xml
@@ -88,4 +88,20 @@
     <string name="sync_inprogress">Sync in progress...</string>
     <string name="fatal_error">Fatal error ! </string>
     
+    <!-- Errors -->
+    <string name="err_sync_get_smslist">Error #1: Invalid data received from server when getting previous messages</string>
+    <string name="err_sync_craft_http_request">Error #2: Error while crafting HTTP request</string>
+    <string name="err_sync_push_request">Error #3: Push request failed</string>
+    <string name="err_sync_push_request_resp">Error #4: Invalid datas received from server when pushing datas</string>
+    <string name="err_sync_create_json_null_smslist">Error #5: NULL Sms List</string>
+    <string name="err_sync_create_json_put_smslist">Error #6: Error while crafting push request</string>
+    <string name="err_sync_create_json_request_encoding">Error #7: Unsupported encoding when generating request</string>
+    <string name="err_sync_auth_failed">Error #8: Authentication failed</string>
+    <string name="err_sync_http_request_returncode_unhandled">Error #9: Server set unhandled HTTP return code</string>
+    <string name="err_sync_http_request_connect">Error #11: Unable to perform a connection to ownCloud instance</string>
+    <string name="err_sync_http_request_httpexception">Error #12: Unable to perform a connection to ownCloud instance</string>
+    <string name="err_sync_http_request_ioexception">Error #13: Unable to perform a connection to ownCloud instance</string>
+    <string name="err_sync_http_request_resp">Error #14: Unable to parse server response</string>
+    <string name="err_sync_http_request_parse_resp">Error #15: Unable to parse server response</string>
+    
 </resources>