The issue arises because there is a clash between a global and a local data store. The Simulink.Signal object 'Temp' in the Data Dictionary defines a global Data Store because it can be accessed by all models in the hierarchy. Thus, the Data Store Memory block in the main model is now redundant because it also declares a local data store named 'Temp'.
You can find more information about the creation and application of Data Stores on the following page of the documentation page:
Please run the below command in the command window of installed MATLAB R2019a version to get release specific documentation
>> web(fullfile(docroot, 'simulink/ug/model-global-data-using-data-stores.html'))
In particular, the final sentence of the section 'Create and Apply Data Stores' should clarify this issue.
To resolve the error and continue with the simulation, you can remove the Data Store Memory block, and then Simulink will automatically read and write to the 'Temp' variable defined in the Data Dictionary. You will notice that the Data Store Read and Write blocks will show that 'Temp' is a global Data Store.
Please follow the below link to search for the required information regarding the current release:
