handle installing frontend packages more gracefully

reflex/utils/prerequisites.py

@@ -930,15 +930,31 @@ def install_frontend_packages(packages: set[str], config: Config):
     """
     # unsupported archs(arm and 32bit machines) will use npm anyway. so we dont have to run npm twice
     fallback_command = (
-        get_package_manager()
-        if not constants.IS_WINDOWS
+        get_package_manager(on_failure_return_none=True)
+        if (
+            not constants.IS_WINDOWS
             or constants.IS_WINDOWS
             and is_windows_bun_supported()
             and not windows_check_onedrive_in_path()
+        )
         else None
     )
+
+    install_package_manager = (
+        get_install_package_manager(on_failure_return_none=True) or fallback_command
+    )
+
+    if install_package_manager is None:
+        raise FileNotFoundError(
+            "Could not find a package manager to install frontend packages. You may need to run `reflex init`."
+        )
+
+    fallback_command = (
+        fallback_command if fallback_command is not install_package_manager else None
+    )
+
     processes.run_process_with_fallback(
-        [get_install_package_manager(), "install"],  # type: ignore
+        [install_package_manager, "install"],  # type: ignore
         fallback=fallback_command,
         analytics_enabled=True,
         show_status_message="Installing base frontend packages",
@@ -949,7 +965,7 @@ def install_frontend_packages(packages: set[str], config: Config):
     if config.tailwind is not None:
         processes.run_process_with_fallback(
             [
-                get_install_package_manager(),
+                install_package_manager,
                 "add",
                 "-d",
                 constants.Tailwind.VERSION,
@@ -965,7 +981,7 @@ def install_frontend_packages(packages: set[str], config: Config):
     # Install custom packages defined in frontend_packages
     if len(packages) > 0:
         processes.run_process_with_fallback(
-            [get_install_package_manager(), "add", *packages],
+            [install_package_manager, "add", *packages],
             fallback=fallback_command,
             analytics_enabled=True,
             show_status_message="Installing frontend packages from config and components",