@Pratyush1MaryKayInTouch wrote: NiFi canvas (Version 1.14) is  failing to load when launched with the loading indicator being indefinitely shown on the screen . The console has the following two  errors: Uncaught Error: SlickGrid requires a valid container, #controlle-service-types-table does not exist in the DOM. Uncaught TypeError : can not read properties of undefined (reading 'get') Uncaught TypeError : can not read properties of undefined (reading 'top')   This issue is observed intermittently  on a particular environment while it works fine in other environments.   Thanks, Pratyush       Hello, The errors you're encountering suggest an issue with the NiFi canvas initialization process. Here's a breakdown and potential solutions: Errors: Uncaught Error: SlickGrid requires a valid container, #controlle-service-types-table does not exist in the DOM. This means the HTML element with the ID "controlle-service-types-table" is missing when the canvas tries to interact with it using the SlickGrid library (used for tables). Uncaught TypeError : can not read properties of undefined (reading 'get') & (reading 'top') These errors indicate NiFi tries to access properties (like "get" or "top") on an element that doesn't exist or hasn't loaded yet. Possible Causes (Since it's intermittent): JavaScript Errors: There might be other JavaScript errors on the page preventing the DOM from loading correctly. Check browser developer console for additional errors. Network Issues: Temporary network delays during canvas initialization could cause some elements to load after the script tries to access them. Browser Caching: Cached browser data might be causing conflicts. Try clearing your browser cache and reloading NiFi. Troubleshooting Steps: Check Browser Console: Open the developer console in your browser (usually by pressing F12) and look for any additional errors besides the ones mentioned. These might provide more specific clues. Clear Browser Cache: Clear your browser cache and hard reload the NiFi canvas (Ctrl+Shift+R). Network Monitoring: If network issues are suspected, monitor network activity during canvas load using developer tools. Look for slow loading resources. NiFi Logs: Check the NiFi logs for any additional error messages related to canvas initialization. I hope the information may help you.    ... View more