diff --git a/__dev__.py b/__dev__.py
index 9ed1af1..3aab20d 100644
--- a/__dev__.py
+++ b/__dev__.py
@@ -6,10 +6,11 @@ THIS_DIR=os.path.dirname(os.path.abspath(__file__))
 DIR_DEV_JS=os.path.abspath(f'{THIS_DIR}/js')
 DIR_WEB_JS=os.path.abspath(f'{THIS_DIR}/../../web/extensions/rgthree')
 
-shutil.rmtree(DIR_DEV_JS)
+if os.path.exists(DIR_DEV_JS):
+  shutil.rmtree(DIR_DEV_JS)
 
 subprocess.run(["./node_modules/typescript/bin/tsc"])
 
-
-shutil.rmtree(DIR_WEB_JS)
+if os.path.exists(DIR_WEB_JS):
+  shutil.rmtree(DIR_WEB_JS)
 shutil.copytree(DIR_DEV_JS, DIR_WEB_JS, dirs_exist_ok=True)
\ No newline at end of file