TextMesh Pro TryAddCharacters Null Pointer Exception

Hi

I'm trying to populate a FontAsset with all the Glyphs On Runtime.
My thought was to do this with the

TryAddCharacters 

function. However I get a NullPointerException:

Code (CSharp):

1. NullReferenceException: Object reference not set to an instance of an object
2. TMPro.TMP_FontAsset.TryAddCharacters (System.String characters, System.String& missingCharacters) (at <2687edf00632410dad9a33972d48cfa4>:0)
3. AddGlyphsDynamic.Start () (at Assets/Scripts/AddGlyphsDynamic.cs:25)

My Code:

Code (csharp):

1. public TMP_FontAsset fontAsset;
2.     public string glyphs;
3.     // Start is called before the first frame update
4.     void Start()
5.     {
6.         string notChars;
7.         if (fontAsset.TryAddCharacters(glyphs, out notChars))    //<----- THIS IS LINE 25
8.         {
9.             Debug.Log(notChars);
10.         }
11.  
12.     }

My Font Asset Configuration:

What am I missing?

Maybe a short explanation why I want to do this:
I have some textcontent i pull from a CMS, so i know on startup what the text is, and that it's not gonna change. Since there is also Chinese Text i don't want to load all existing glyphs but only the one i need later.

 

Hi
I'm on Unity 2019.2.21 using the TextMeshPro 2.0.1 Package

 

Sorry it seems i cant post the chinese glyphs because its marked as spam...
These are the unicodes instead:
\u4f5c\u70ba\u6f22\u8a9e\u65cf\u5404\u7a2e\u6f22\u8a9e\u8a9e\u8a00

 

i tested with the preview package and i still get a NullPointerException:

Code (CSharp):

1. NullReferenceException: Object reference not set to an instance of an object
2. TMPro.TMP_FontAsset.TryAddCharacters (System.String characters, System.String& missingCharacters, System.Boolean includeFontFeatures) (at Library/PackageCache/com.unity.textmeshpro@2.1.0-preview.8/Scripts/Runtime/TMP_FontAsset.cs:1607)
3. AddGlyphsDynamic.Start () (at Assets/Scripts/AddGlyphsDynamic.cs:15)

I tested different fonts (latin and chinese) and different glyphs ant i always get this error...
When i add the Chinese Glyphs not with the script, but by just enter them in the textfield form the TMP Component it workes...

 

i was able to fix it, i had to read the fontasset first, otherwise the CharacterLookupDictionary is null.

Code (CSharp):

1.  
2. public TMP_FontAsset fontAsset;
3. public string glyphs;
4. void TestAddCharacter()
5. {
6.         fontAsset.ReadFontAssetDefinition();
7.         string notChars;
8.         if (fontAsset.TryAddCharacters(glyphs, out notChars))
9.         {
10.             Debug.Log(notChars);
11.         }
12. }