Remove null result

[de_tarek2]

@Mostafa_El_Ayoubi @Kulkul
I’m sorry man to annoyed you again , I need your help I tried so much time to solve it it’s not working, the same topic renumbers the door can you please check this photo

I have three question
1-how I can remove “No to room” from the list I think it makes Null
2-Can I create list for the doors swing to the same room ,may if that possible the door will have the proper name
2-I used dyn script to remove all the value of “Mark” parameter then when I used another script to set value for “Mark” parameter still empty , I can remove the effect of every script I used in one Revit file (don’t know if that correct or not)
Finally can you please take a look at this script, it’s not working probably all the previous issue(Question) regarding this script
DOORWITHROOMTARIQLAST ONE.dyn (9.3 KB)

[Kulkul]

Use List.Clean node set false for preserveIndices.

[de_tarek2]

Thanks man i did it

[Kulkul]

No you need to use List.Clean node after Get.Parameter node.

[de_tarek2]

perfect this clean one warning but still this

[Kulkul]

Make sure you match your list of values and list of elements.Check the count for both.

[de_tarek2]

understand the list of elements refer to doors which are the count of them more than the count of the list of values(ToRoom)
this was my 2nd question , I think I need to create a list of the doors depending on the room where the doors swing to

[Kulkul]

Can you show screenshot count of elements and count of values.

[de_tarek2]