I have a problem about Code block

i got a problem about code block it doesnt work

The error say…
Error: Sheet is a class name, can’t be used as a variable.

i didnt understand it

i use dynamo

If you want variables, change it a bit:

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Most common revit objects are built in a class wich need to have a name.

Those names are RESERVED to make sure commands called under the hood or custom blocks using those classes work properly.

As Johannes said, change them a bit, as they are case sensitive. I usually add a reference after it to know what is going on like: View_Filtered or Sheet_Series100. works a bit like comments in a code.

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oh i see thanks