Stored procedure returns Expected to read 4 header bytes but only received 0

I have the following Stored Procedure:

CREATE DEFINER=`user11`@`%` PROCEDURE `UpdateDimDateEntity`(IN DimDateKey INT, IN FullDate DATE, IN DayName NVARCHAR(50), IN DayOfWeek SMALLINT) BEGIN UPDATE DimDate SET FullDate = FullDate, DayName = DayName, DayOfWeek = DayOfWeek WHERE DimDate.DimDateKey = DimDateKey; END

And Im calling it from my .NET 7 app. I receive an error "Expected to read 4 header bytes but only received 0"

Does anyone know why?