Question4Replies245Views WilliamM0713 Member since 2017 8 posts The Mitre Corporation Posted: 2 years agoLast activity: 2 years 10 months ago Closed Cannot access properties and stub data transformI have followed the tutorial for accessing an external mssql database here: https://www.pegaxchange.com/category/integration/interacting-with-an-ex… . After closing the Connector and Metadata Wizard I open the Application Explorer and get an error: Low-Code App Development Dev/Designer Studio Data Integration ×Close popoverFacebookTwitterLinkedinEmail Copy Link Copied! Moderation Team has archived post This thread is closed to future replies. Content and links will no longer be updated. If you have the same/similar Question, please write a new Question. Posted: 2 years agoSudhakarReddy PEGA replied to WilliamM0713Hi, It's not an error it is showing the class doesn't have instances. Have you created objects of the class ? Posted: 2 years agoHOULJ PEGA replied to SudhakarReddyTo be more specific: the text on the tab is saying the correct thing: the class is abstract and therefore does not have instances. I believe the issue is that the Application explorer is not functioning properly. Logging out and then logging back in could solve this. Posted: 2 years agoWilliamM0713 The Mitre Corporation replied to SudhakarReddySomething went wrong and I could not recreate the issue. Starting over fixed it. Posted: 2 years agoBenjaminH Labb Consulting replied to WilliamM0713I'd be interested in knowing the results of this. The error message shown indicates that no "Key" has been defined on the class rule any instances would belong to... My understanding was that you would need to use RDB- methods in order to access external databases without the required Pega properties defined, not Obj- methods.