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This error may occur when attempting to download the runtime sketch.
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This error may occur when attempting to download the runtime sketch.
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Solutions:
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Solutions:
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-[Verify that the correct port is selected in the manual sketch download widget.](https://support.arduino.cc/hc/en-us/articles/16724283965596)
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1.[Verify that the correct port is selected in the manual sketch download widget.](https://support.arduino.cc/hc/en-us/articles/16724283965596)
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- Double-tap the device’s reset button to put it in bootloader mode. First, try selecting the correct COM port. If that doesn’t work, set the Port to “Automatic (BootLoader)” and attempt to download the sketch again.
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1. Double-tap the device’s reset button to put it in bootloader mode. First, try selecting the correct COM port. If that doesn’t work, set the Port to “Automatic (BootLoader)” and attempt to download the sketch again.
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- Close any applications blocking the port, such as the Arduino IDE serial monitor.
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1. Close any applications blocking the port, such as the Arduino IDE serial monitor.
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-[Reformat the QSPI flash memory](https://support.arduino.cc/hc/en-us/articles/16206977438748-Reset-the-flash-memory-on-STM32H747-based-devices)
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1.[Reformat the QSPI flash memory](https://support.arduino.cc/hc/en-us/articles/16206977438748-Reset-the-flash-memory-on-STM32H747-based-devices)
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- Create a new project and attempt to download the runtime again.
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1. Create a new project and attempt to download the runtime again.
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-**"Error: "(DownloadSketch) Can not download sketch: COM port must be used!"**
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### Error: "(DownloadSketch) Can not download sketch: COM port must be used!"
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This error occurs when no COM port is selected.
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This error occurs when no COM port is selected.
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[Select the correct COM port in the manual sketch download widget](https://support.arduino.cc/hc/en-us/articles/16724283965596) and attempt the download again.
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[Select the correct COM port in the manual sketch download widget](https://support.arduino.cc/hc/en-us/articles/16724283965596) and attempt the download again.
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-**If nothing happens when downloading the runtime sketch**
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### If nothing happens when downloading the runtime
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- Ensure you've installed the latest version of the Arduino PLC IDE software from the Arduino Software page.
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1. Ensure you've installed the latest version of the Arduino PLC IDE software from the Arduino Software page.
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- Verify the "T" Folder Exists
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1. Verify the "T" Folder Exists
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`C:\Users\<Profile-Name>\AppData\Local\T`
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`C:\Users\<Profile-Name>\AppData\Local\T`
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If you can't find this folder, Copy it from the computer's Admin profile (which requires access authorization, e.g., the admin password) and paste it into the same path on the user profile.
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If you can't find this folder, Copy it from the computer's Admin profile (which requires access authorization, e.g., the admin password) and paste it into the same path on the user profile.
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- Restart PLC IDE.
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1. Restart PLC IDE.
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---
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### Connect to device
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##If there is an issue connecting to a device
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-**If the "On-Line > Set up communications" and "On-line > Connect" options are disabled**
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### If the "On-Line > Set up communications" and "On-line > Connect" options are disabled
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These options are only available when a project is open. Select **File > New Project** to create a new project.
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These options are only available when a project is open. Select **File > New Project** to create a new project.
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-**Error: “Unable to start the communication”**
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### Error: “Unable to start the communication”
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When choosing **On-line > Set up communications** you may get this error message:
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When choosing **On-line > Set up communications** you may get this error message:
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```
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Unable to start the communication
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Choose 'On-line / Set up communication' to configure it
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```
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```
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Unable to start the communication
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Choose 'On-line / Set up communication' to configure it
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```
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Resolve the issue by selecting **On-line > Set up communication** and checking the settings. See [Connect to the Device](https://docs.arduino.cc/software/plc-ide/tutorials/plc-ide-setup-license#5-connect-to-the-device) for help.
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Resolve the issue by selecting **On-line > Set up communication** and checking the settings. See [Connect to the Device](https://docs.arduino.cc/software/plc-ide/tutorials/plc-ide-setup-license#5-connect-to-the-device) for help.
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-**“Error” in the bottom right corner on first use of the board**
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### “Error” in the bottom right corner on first use of the board
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[Reformat the QSPI flash memory.](https://support.arduino.cc/hc/en-us/articles/16206977438748-Reset-the-flash-memory-on-STM32H747-based-devices)
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[Reformat the QSPI flash memory.](https://support.arduino.cc/hc/en-us/articles/16206977438748-Reset-the-flash-memory-on-STM32H747-based-devices)
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---
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### License activation
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##If there is an issue activating the license
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When activating the license for Arduino Opta or Portenta Machine Control, the following errors may occur:
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-**Opta**
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### Opta
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After clicking “Activate PLC Runtime”:
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`Could not activate licenses for the following products: AIPC_Arduino_Opta`
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After clicking “Activate PLC Runtime”: `Could not activate licenses for the following products: AIPC_Arduino_Opta`
Offline activation: `Could not activate licenses for the following products: AIPC_Arduino_PMC`
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- Offline activation: `Could not activate licenses for the following products: AIPC_Arduino_PMC`
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Solutions:
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- Upload the [Memory Partitioning sketch](https://docs.arduino.cc/tutorials/opta/memory-partitioning/) using Arduino IDE. Then, try to activate the license again.
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- If you are using a company-owned computer, please follow these steps:
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1. Temporarily disable any antivirus software running on your system.
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1. Temporarily disable any antivirus software running on your system.
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1. Temporarily disable the firewall on your computer.
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1. Temporarily disable the firewall on your computer.
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1. Attempt the license activation process again.
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1. Attempt the license activation process again.
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> [!NOTE]
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> Corporate networks and security programs can sometimes interfere with license activation. By temporarily disabling these protective measures, you may be able to complete the activation successfully.
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> [!NOTE]
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> Corporate networks and security programs may interfere with license activation. Disabling these temporarily can help complete the process.
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