Please double check the declaration of the "Type" Parameter in the Parameter Tab of the Report Definition Rule. Please make sure that the data type selected for the "Type" parameter is the same as the data type of the .Type column you are referencing in the Filter Condition. Also make sure that the "Type" parameter is defined as a "Required" and as an "Input" parameter. Then Save the Report Definition Rule before referencing it in the Filter Condition. Once the Rule Definition is successfully saved with the "Type" Parameter, then add it to the Filter Condition. When selecting the "Type" parameter for the right side of the Filter Condition, please use the down arrow key on your keyboard and highlight and select "Param.Type" by selecting it with the Enter key on your keyboard (this will help ensure the syntax for the reference to the "Type" parameter is correct.
What exercise environment are you using to complete the exercises (Pega Cloud or the local Personal Virtual Server (PVS) VMWare instance)? Also, on which exercise where you working on when you encountered the error message?