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# Troubleshooting CORE
**Warning:** This is a very messy document. Use the table of contents to get to your specified error. If you can't find your problem here, [create a issue](https://git.staropensource.de/staropensource/core/issues/new).

## Invalid argument issues
### (wmgr) [ERROR] Invalid window mode "`<PLACEHOLDER>`".
[wmgr's set_mode() function](/references/wmgr/#set_mode) recieved a invalid window mode. Only possible options are `"WINDOWED"`, `"MINIMIZED"`, `"MAXIMIZED"`, `"FULLSCREEN"` and `"EXCLUSIVE_FULLSCREEN"`.
### (smgr) [ERROR] Resource is not type of PackedScene
You tried loading something that's not a scene into the SceneTree. Check against what you are loading first!

## Common errors
### (smgr) [ERROR] Failed adding `<PLACEHOLDER>` scene: Only one `<PLACEHOLDER>` scene is allowed
Only one scene can be loaded into the `game` and `cutscene` overlays. Perform a check against the overlay first! [Click here for the smgr reference page](/references/smgr/)
### (smgr) [ERROR] Failed removing `<PLACEHOLDER>` scene: No `<PLACEHOLDER>` scene is active
You tried removing a scene in the `game` or `cutscene` overlay, but no scene is loaded in that overlay. Perform a check against the overlay first! [Click here for the smgr reference page](/references/smgr/)
### (smgr) [ERROR] Failed adding `<PLACEHOLDER>` scene: `<PLACEHOLDER>` scene with name "`<PLACEHOLDER>`" already exists
You tried loading a scene into the `menu` or `debug` overlay, but another scene with the same name already exists in that overlay. Perform a check against the overlay first! [Click here for the smgr reference page](/references/smgr/)
### (resmgr) [ERROR] Loading "`<PLACEHOLDER>`" failed: Resource is loaded already
You tried loading a resource with the resource manager, but a resource with the same name is loaded already. Perform a check against the resmgr first! [Click here for the resmgr reference page](/references/resmgr/)
### (resmgr) [ERROR] Unloading "`<PLACEHOLDER>`" failed: Resource is not present
You tried unloading a resource that is not loaded. Perform a check against the resmgr first! [Click for the resmgr reference page](/references/resmgr/)
### (resmgr) [ERROR] `<Unloading/Loading>` a batch failed: Batch is empty
The resource manager can't process a empty batch. Fill it with some information. [Click for the resmgr reference page](/references/resmgr/)


## Startup issues
### coreinit -> CORE only supports Godot `<PLACEHOLDER>`. Please upgrade/downgrade your Godot Project to `<PLACEHOLDER>`.
Update or downgrade your Godot version to one that CORE supports. See the [requirements page](/requirements/) for more information.
### coreinit -> The CORE logger is missing in your autoload project settings!
The CORE logger (found at `res://CORE/logger.gd`) is missing from your autoload list. Just add it under the name `Logger` and make sure to check `Global variable`.
### coreinit -> The CORE preprocessor is missing in your autoload project settings!
The CORE preprocessor (found at `res://CORE/preprocessor.gd`) is missing from your autoload list. Just add it under the name `Preprocessor` and make sure to check `Global variable`.
### coreinit -> The CORE configuration file (config.gd) is missing! Please copy the config.gd.example file and rename it to config.gd!
The CORE configuration file is missing. Just copy `config.gd.example` and rename it to `config.gd`. Make sure to update it to your likings.
### coreloader.gd:46 @ _ready(): Resource file not found: res://.
The variable `core_startupscript` in CORE's `config.gd` file is empty or points to a missing script. Either set the variable or create a new initialization script.

## Impossible errors
**If you somehow encounter one of these errors, [report them immediately please](https://git.staropensource.de/staropensource/core/issues/new).**
### Failed attaching `<PLACEHOLDER>` to CORE: Invalid component
Failed attaching a CORE component (for example `resmgr`) to the CORE holder (`core.gd`).
### Failed to get window mode: The window mode id "`<PLACEHOLDER`>" is not known to CORE.
Godot reported a window mode that CORE can't handle. Can be caused if the version check is removed and a higher Godot version is used than CORE supports.