diff --git a/notebook/static/tree/js/notebooklist.js b/notebook/static/tree/js/notebooklist.js
index 082320008..cabff155d 100644
--- a/notebook/static/tree/js/notebooklist.js
+++ b/notebook/static/tree/js/notebooklist.js
@@ -102,7 +102,7 @@ define([
                             OK: {'class': 'btn-primary'}
                         }
                     });
-                    console.warn('Error durring New file creation', e);
+                    console.warn('Error during New file creation', e);
                 });
                 that.load_sessions();
             });
@@ -122,7 +122,7 @@ define([
                             OK: {'class': 'btn-primary'}
                         }
                     });
-                    console.warn('Error durring New directory creation', e);
+                    console.warn('Error during New directory creation', e);
                 });
                 that.load_sessions();
             });
@@ -765,7 +765,7 @@ define([
                                     OK: {'class': 'btn-primary'}
                                 }
                             });
-                            console.warn('Error durring renaming :', e);
+                            console.warn('Error during renaming :', e);
                         });
                     }
                 }
@@ -838,7 +838,7 @@ define([
                                         OK: {'class': 'btn-primary'}
                                     }
                                 });
-                                console.warn('Error durring moving :', e);
+                                console.warn('Error during moving :', e);
                             });
                         });  // End of forEach.
                     }
@@ -896,7 +896,7 @@ define([
                                         OK: {'class': 'btn-primary'}
                                     }
                                 });
-                                console.warn('Error durring content deletion:', e);
+                                console.warn('Error during content deletion:', e);
                             });
                         });
                     }
@@ -939,7 +939,7 @@ define([
                                         OK: {'class': 'btn-primary'}
                                     }
                                 });
-                                console.warn('Error durring content duplication', e);
+                                console.warn('Error during content duplication', e);
                             });
                         });
                     }
@@ -1013,7 +1013,7 @@ define([
                                 }
                             }}
                         });
-                        console.warn('Error durring notebook uploading', e);
+                        console.warn('Error during notebook uploading', e);
                         return false;
                     }
                     content_type = 'application/json';