Overview
In this article, we'll look at common errors with Lister Connect that result in labels and barcodes failing to print or scales not importing weights to Lister when using a Mac. We’ll also provide step-by-step instructions on how to diagnose and fix these issues. If you’re using Windows, please review our Windows troubleshooting guide here.
Note: If you’re running into errors during the installation process of Lister Connect, please refer to our installation troubleshooting guide here.
💡Operational Tip: If labels are printing, but are printing incorrectly, follow our printer troubleshooting guide by clicking the link below!
Table Of Contents
How to Verify Lister Connect is Running
Lister Connect is a background app that runs on your Mac and is required for printing via Lister. If you've not installed Lister Connect on your Mac, please follow this guide.
If you are unable to print or import weights from scales using Lister, first check to see if the printer icon in the top right corner of Lister is red or green.
If the printer icon is RED, it means the connection between Lister and the Lister Connect app is not turned on. Continue to the "Unable to establish connection with printer” section to diagnose and fix
If the printer icon is GREEN, it means the connection is working. Click here for more troubleshooting steps if you are unable to print labels or import weights from scales to Lister
Unable to Print Labels: "Unable to establish connection with printer" Error
If the printer icon at the top right corner of Lister is RED and you see a pop-up warning that says “Unable to establish connection with printer" when trying to print, Lister cannot communicate with Lister Connect.
Here's how to resolve it:
Step 1: Ensure Lister Connect is running on your Mac
Open the Spotlight search tool (⌘ command + space) and search for "Lister Connect"
Select “Lister Connect” from the Applications section in the search results
A blue Upright Labs icon in the top right status menu of your desktop indicates Lister Connect is actively running
Note: If you don’t see Lister Connect in your spotlight search results, follow the link below for our guide to installing Lister Connect on Mac:
Step 2: Verify Upright Labs is not Blocked from Lister Connect
From here, verify that Lister Connect is not blocked from passing information to Lister by following the steps below:
Click the Lister Connect icon in the top right status menu of your desktop
Mouse over “Advanced” in the dropdown menu
Click “Site Manager” in the spillover menu
Click the “Blocked” tab and verify Upright Labs is NOT being blocked
Step 3: Reconnect Lister Connect in Lister
Login to Lister and click the red printer icon in the top-right corner
Click the blue “Reconnect” button in the dropdown menu
If the blue “Reconnect” button does not work and the printer icon does not turn green, follow the steps below:
Open a new browser tab and navigate to https://localhost:8181/
Click "Advanced"
Click “Proceed to localhost (unsafe)"
Note: If you do not see "Advanced" or "Proceed to localhost" type in "thisisunsafe" (without quotations) on the page to continue.
If you see a page that says “HTTP Error: 500” this means the certificate has been approved
From here, return to Lister and repeat the following steps:
Log in to Lister and click the red printer icon in the top-right corner
Click the blue “Reconnect” button in the dropdown menu. If this doesn’t work, please reach out via live chat or email us at support@uprightlabs.com so we can provide additional assistance
Unable to Print Labels: "No Current Printer Setup" Error
If the printer icon at the top right corner of Lister is GREEN and you see a red pop-up warning that says “No current printer setup" when trying to print, this means Lister Connect is working, but Lister does not know where to send the print job.
Click on the green printer icon in the top-right corner of Lister
Select a printer from the dropdown list
If your printer isn’t visible in the dropdown list, try the following:
Double check the printer is both powered on and connected to your Mac via USB
Click the “Refresh” icon to find any newly connected printers
If the above steps don’t help, verify Upright Labs is not blocked from Lister Connect by following the steps linked here.
Unable to Import Weights From USB Scales
If USB scales fail to import weights into the New Shipment or Product Page, verify the scale is powered on and connected to your Mac via a USB cable. From there, verify Lister Connect is running and follow the steps below:
Click the green printer icon in the top right corner of Lister
Ensure your scales are selected in the scale dropdown menu
If your scales aren’t visible in the dropdown list, try the following:
Double check the scale is both powered on and connected to your Mac via USB
Click the “Refresh” icon to find any newly connected scales
Related Guides
Have questions? Reach out to us at support@uprightlabs.com or via chat anytime between 9am-6pm ET, Monday to Friday.