I have trouble with adding spellcasting ability to my homebrew.

I tried to make Eldritch Knight as a homebrew and it works with the spellcasting ability but when i try to make Arcane trickster it dosen't.

I have done the same way with the Arcane Trickster as I did with the Eldritch Knight, but it will not work..am i missing anything? 

I filled in "Yes" on "can cast spells?", and "INT" on Ability mod and Wizard for spellcasting list.. All the same as E-Knight and it works. 

I have created a feat named "Spellcasting".. And it still wont work.. 

Yes, i have even used a small and big first letter and write it over and over.

Yes, all levels after 3rd.

I created it yesterday so it should be working, the other features and stuff works great but not the spell slots and spells.

It's strange because it worked when i did Eldritch Knight 

https://www.dndbeyond.com/classes/rogue/subclass/810085/edit

Do you mean this link? 

Here is a "test" character with the homebrew, that is dosen't work

ddb.ac/characters/47535269/bjVhtO

Quote from GorgBattlehammer >>

Here is a "test" character with the homebrew, that is dosen't work

ddb.ac/characters/47535269/bjVhtO

 That test character has the Spellcasting ability and spell slots. All you need do is add spells.

Are you perchance running any ad/popup blockers, browser extensions, or a VPN that may be interfering with DDB?

PS- In future, instead of using the “share link,” please provide a copy of the actual URL for the character sheet so that the Mods and Staffers can better assist you.

One thing that is probably messing you up, you have added both Pact Magic and Spellcasting to that homebrew. The system doesn’t like when we do that. I recommend deleting the Pact Magic feature and then re-saving the entire homebrew using the main [SAVE CHANGES] button under Basic Information.

https://www.dndbeyond.com/profile/GorgBattlehammer/characters/47520602

Here is an actuall character that have the "right" Homebrew of my Arcane Trickster, but it still dosen't work

Quote from IamSposta >>

One thing that is probably messing you up, you have added both Pact Magic and Spellcasting to that homebrew. The system doesn’t like when we do that. I recommend deleting the Pact Magic feature and then re-saving the entire homebrew using the main [SAVE CHANGES] button under Basic Information.

 Yes, i was just testing if pact magic worked instead of Spellcasting 

Quote from GorgBattlehammer >>

https://www.dndbeyond.com/profile/GorgBattlehammer/characters/47520602

Here is an actuall character that have the "right" Homebrew of my Arcane Trickster, but it still dosen't work

 And if i now make a new subclass  and do everything from the beginning it wont work 

Quote from GorgBattlehammer >>

https://www.dndbeyond.com/profile/GorgBattlehammer/characters/47520602

Here is an actuall character that have the "right" Homebrew of my Arcane Trickster, but it still dosen't work

 Double check under Basic Information that “Can Cast Spells” is set to “yes,” that a “spellcasting ability” has been selected (should be Int), that the “Wizard” spell list was designated, and that the rest of those fields are blank. Then, re-save the entire homebrew using the main [SAVE CHANGES] button. Then wait 20 minutes and check again. (Try adding a level to Theodart to make sure the server updates its internal cache.)

I have done all that now and it still wont work

And you’re sure that “Spell Prepare Type” and “Knows All Spells” are both blank.

Yes it works now, i don't know what was wrong. I deleted the homebrew and did a new one and it worked fine.