What the title says. I used a prompt with these special characters " " to indicate text I wanted in the sprite. I got the error I pasted below.
Best solutions seems to block illegal characters from being entered in the prompt inputfield, and provide a popup warning if you type illegal characters.
ArgumentException: Illegal characters in path.
System.IO.Path.Combine (System.String path1, System.String path2) (at <b89873cb176e44a995a4781c7487d410>:0)
Unity.Muse.Common.Editor.ExporterHelpers.GetPath (System.String directory, System.String fileName, System.String extension, System.Int32 maxPathLength) (at ./Library/PackageCache/com.unity.muse.common@0.3.0/Editor/Exporters/ExporterHelpers.cs:134)
Unity.Muse.Common.Editor.ExporterHelpers.GetUniquePath (System.String directory, System.String fileName, System.String extension) (at ./Library/PackageCache/com.unity.muse.common@0.3.0/Editor/Exporters/ExporterHelpers.cs:159)
Unity.Muse.Common.Editor.EditorModelAssetEditor.GetSavePath (Unity.Muse.Common.Model currentModel, System.Boolean showDialog) (at ./Library/PackageCache/com.unity.muse.common@0.3.0/Editor/EditorModelAssetEditor.cs:91)
Unity.Muse.Common.Editor.MuseEditor.OnGenerateButtonClicked () (at ./Library/PackageCache/com.unity.muse.common@0.3.0/Editor/MuseEditor.cs:311)
Unity.Muse.Common.Model.GenerateButtonClicked () (at ./Library/PackageCache/com.unity.muse.common@0.3.0/Runtime/UI/Models/Model.cs:166)
Unity.AppUI.UI.Pressable.Invoke (UnityEngine.UIElements.EventBase evt) (at ./Library/PackageCache/com.unity.dt.app-ui@0.5.1/Runtime/UI/Manipulators/Pressable.cs:101)
Unity.AppUI.UI.Pressable.InvokePressed (UnityEngine.UIElements.EventBase evt) (at ./Library/PackageCache/com.unity.dt.app-ui@0.5.1/Runtime/UI/Manipulators/Pressable.cs:97)
Unity.AppUI.UI.Pressable.OnPointerUp (UnityEngine.UIElements.PointerUpEvent evt) (at ./Library/PackageCache/com.unity.dt.app-ui@0.5.1/Runtime/UI/Manipulators/Pressable.cs:335)
UnityEngine.UIElements.EventCallbackFunctor`1[TEventType].Invoke (UnityEngine.UIElements.EventBase evt, UnityEngine.UIElements.PropagationPhase propagationPhase) (at <9d7fc877145d4138982bf12cdd3484c6>:0)
UnityEngine.UIElements.EventCallbackRegistry.InvokeCallbacks (UnityEngine.UIElements.EventBase evt, UnityEngine.UIElements.PropagationPhase propagationPhase) (at <9d7fc877145d4138982bf12cdd3484c6>:0)
UnityEngine.UIElements.CallbackEventHandler.HandleEvent (UnityEngine.UIElements.EventBase evt) (at <9d7fc877145d4138982bf12cdd3484c6>:0)
UnityEngine.UIElements.CallbackEventHandler.HandleEventAtCurrentTargetAndPhase (UnityEngine.UIElements.EventBase evt) (at <9d7fc877145d4138982bf12cdd3484c6>:0)
UnityEngine.UIElements.CallbackEventHandler.HandleEventAtTargetPhase (UnityEngine.UIElements.EventBase evt) (at <9d7fc877145d4138982bf12cdd3484c6>:0)
UnityEngine.UIElements.PointerCaptureDispatchingStrategy.DispatchEvent (UnityEngine.UIElements.EventBase evt, UnityEngine.UIElements.IPanel panel) (at <9d7fc877145d4138982bf12cdd3484c6>:0)
UnityEngine.UIElements.EventDispatcher.ApplyDispatchingStrategies (UnityEngine.UIElements.EventBase evt, UnityEngine.UIElements.IPanel panel, System.Boolean imguiEventIsInitiallyUsed) (at <9d7fc877145d4138982bf12cdd3484c6>:0)
UnityEngine.UIElements.EventDispatcher.ProcessEvent (UnityEngine.UIElements.EventBase evt, UnityEngine.UIElements.IPanel panel) (at <9d7fc877145d4138982bf12cdd3484c6>:0)
UnityEngine.UIElements.EventDispatcher.Dispatch (UnityEngine.UIElements.EventBase evt, UnityEngine.UIElements.IPanel panel, UnityEngine.UIElements.DispatchMode dispatchMode) (at <9d7fc877145d4138982bf12cdd3484c6>:0)
UnityEngine.UIElements.BaseVisualElementPanel.SendEvent (UnityEngine.UIElements.EventBase e, UnityEngine.UIElements.DispatchMode dispatchMode) (at <9d7fc877145d4138982bf12cdd3484c6>:0)
UnityEngine.UIElements.UIElementsUtility.DoDispatch (UnityEngine.UIElements.BaseVisualElementPanel panel) (at <9d7fc877145d4138982bf12cdd3484c6>:0)
UnityEngine.UIElements.UIElementsUtility.UnityEngine.UIElements.IUIElementsUtility.ProcessEvent (System.Int32 instanceID, System.IntPtr nativeEventPtr, System.Boolean& eventHandled) (at <9d7fc877145d4138982bf12cdd3484c6>:0)
UnityEngine.UIElements.UIEventRegistration.ProcessEvent (System.Int32 instanceID, System.IntPtr nativeEventPtr) (at <9d7fc877145d4138982bf12cdd3484c6>:0)
UnityEngine.UIElements.UIEventRegistration+<>c.<.cctor>b__1_2 (System.Int32 i, System.IntPtr ptr) (at <9d7fc877145d4138982bf12cdd3484c6>:0)
UnityEngine.GUIUtility.ProcessEvent (System.Int32 instanceID, System.IntPtr nativeEventPtr, System.Boolean& result) (at <aa75c951dea44e839ed36863e532f0e2>:0)