Issue with Using LookML Code in Looker Studio

Error Message: 

Looker Studio cannot connect to your data set. Failed to fetch data from the underlying data set.
 
I am trying to integrate our existing LookML code, which we have been using in Looker, into Looker Studio. We are facing an issue with an always_filter that we used previously, as it seems that Looker Studio does not support this feature and returns an error.(The specific filter causing the issue is filter type: date)

When we use conversational analytics, it correctly recognizes everything except for this filter. However, when I open the looker studio report manually and select a date myself, the error message disappears.

 
 
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