Flow does not open in Flow designer - Support and Troubleshooting

Flow does not open in Flow designer Issue Flow can not open in the designer The page never finishes loading we get the following error in console log:

designer-bundle.min.js?sysparm_substitute=false&version=1.4.36:73313 uncaught at fetchFlowDetailsFromServerSaga SyntaxError: Unexpected token c in JSON at position 0 at JSON.parse () at getServiceCatalogVariablesInputLanguage (https://constellationsandbox.service-now.com/scripts/designer-bundle.min.js?sysparm_substitute=false&version=1.4.36:63544:62) at natLangHtmlComponentInstance (https://constellationsandbox.service-now.com/scripts/designer-bundle.min.js?sysparm_substitute=false&version=1.4.36:63576:48) at https://constellationsandbox.service-now.com/scripts/designer-bundle.min.js?sysparm_substitute=false&version=1.4.36:85578:92 at Array.forEach () at https://constellationsandbox.service-now.com/scripts/designer-bundle.min.js?sysparm_substitute=false&version=1.4.36:85577:21 at https://constellationsandbox.service-now.com/scripts/designer-bundle.min.js?sysparm_substitute=false&version=1.4.36:137532:25 at https://constellationsandbox.service-now.com/scripts/designer-bundle.min.js?sysparm_substitute=false&version=1.4.36:137494:25

Cause The service catalog flow has a "Get Catalog Variables" action that is referencing a catalog item that no longer exists on the system and is trying to retrieve the catalog item template for the list of variables Resolution from the client-side stack trace above add a breakpoint above the line where getServiceCatalogVariablesInputLanguage is called from the local scope open the object variable: templateCatalogItemInput you will see the templateCatalogItemInput.value equals a sys_id this is where it's breaking because it's expecting a JSON object change the value to a blank object "{}" your flow should now open

Alternatively, you can import the catalog item it was referencing