Errors with a "does not exist" query

[variable (Andrew Pease)]

I've tried the following to only return processes but get an error each time:

event.category:process and process.name:"rundll32.exe" and not process.args:*

Logs- (error, trying to only return processes)*
event.category:process and process.name:"rundll32.exe" and not process.args:*

I really don't understand...we have the same query that was getting errors yesterday - but now...not.

event.category:process and process.name:"rundll32.exe" and not process.args:*

I guess I'll just mark this as solved. Thanks!