diff --git a/src/duplicacy_acdstorage.go b/src/duplicacy_acdstorage.go
index ecbd092..e525373 100644
--- a/src/duplicacy_acdstorage.go
+++ b/src/duplicacy_acdstorage.go
@@ -55,7 +55,7 @@ func CreateACDStorage(tokenFile string, storagePath string, threads int) (storag
 				return nil, err
 			}
 		} else if !isDir {
-			return nil, fmt.Errorf("%s/%s is not a directory", storagePath+"/"+dir)
+			return nil, fmt.Errorf("%s is not a directory", storagePath+"/"+dir)
 		}
 		storage.idCache[dir] = dirID
 	}
diff --git a/src/duplicacy_chunkuploader_test.go b/src/duplicacy_chunkuploader_test.go
index 9becd29..f8312ec 100644
--- a/src/duplicacy_chunkuploader_test.go
+++ b/src/duplicacy_chunkuploader_test.go
@@ -111,7 +111,7 @@ func TestUploaderAndDownloader(t *testing.T) {
 	for i, chunk := range chunks {
 		downloaded := chunkDownloader.WaitForChunk(i)
 		if downloaded.GetID() != chunk.GetID() {
-			t.Error("Uploaded: %s, downloaded: %s", chunk.GetID(), downloaded.GetID())
+			t.Errorf("Uploaded: %s, downloaded: %s", chunk.GetID(), downloaded.GetID())
 		}
 	}
 
diff --git a/src/duplicacy_storage_test.go b/src/duplicacy_storage_test.go
index c0fdf40..01c333a 100644
--- a/src/duplicacy_storage_test.go
+++ b/src/duplicacy_storage_test.go
@@ -514,7 +514,7 @@ func TestStorage(t *testing.T) {
 	} else {
 		err = storage.DeleteFile(0, filePath)
 		if err != nil {
-			t.Errorf("Failed to delete file %s: %v", filePath)
+			t.Errorf("Failed to delete file %s: %v", filePath, err)
 		} else {
 			time.Sleep(time.Duration(delay) * time.Second)
 			filePath, exist, _, err = storage.FindChunk(0, chunks[1], true)
diff --git a/src/duplicacy_utils_test.go b/src/duplicacy_utils_test.go
index 61a833a..82d508b 100644
--- a/src/duplicacy_utils_test.go
+++ b/src/duplicacy_utils_test.go
@@ -112,7 +112,7 @@ func TestRateLimit(t *testing.T) {
 		return
 	}
 	if int(n) != len(content) {
-		t.Errorf("Wrote %s bytes instead of %s", n, len(content))
+		t.Errorf("Wrote %d bytes instead of %d", n, len(content))
 		return
 	}
 
@@ -127,7 +127,7 @@ func TestRateLimit(t *testing.T) {
 		return
 	}
 	if int(n) != len(content) {
-		t.Errorf("Copied %s bytes instead of %s", n, len(content))
+		t.Errorf("Copied %d bytes instead of %d", n, len(content))
 		return
 	}