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When compiling or uploading code, this error will occur if no board is selected, or if the board core is not installed.
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The error occurs if no board has been selected.
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Note that a board needs to be selected even if you're not uploading any code.
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Note that a board needs to be selected even if you're not uploading any code (i.e. clicking  Verify).
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## Is a board selected?
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## Select board
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Since the code cannot compile without a board selected, we'll start by ensuring just that.
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With IDE 2, you can use the board selector menu:
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* Connected boards that were identified by Arduino IDE will appear in the list.
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* To manually select the board, or to select a board without connecting it, choose _Select other board and port_.
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It should be looking somewhat like the above. The name of your board should be visible in the board dropdown bar. There may also be a red cross. This indicates that the board isn't available on any port but this will not prevent the code from compiling.
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If it reads `no board selected`, a board needs to be selected. Click to open the dropdown.
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Alternatively, use the _Tools > Board_ menu option:
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If you have a board plugged in, and you want to write code for that board, you can choose it in the dropdown. Otherwise, choose 'Select Other Board & Port'.
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See [Select board and port in Arduino IDE](https://support.arduino.cc/hc/en-us/articles/4406856349970-Select-board-and-port-in-Arduino-IDE) to learn more.
In this case, choose 'Yes' to have the required core installed.
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## Is the board core installed?
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In this case, choose **Yes** to install the required core.
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In the above example, we used the pop-up to install the required core. If you didn't receive a pop-up, or if you're receiving the same error despite a board being selected, please ensure the *board core* is installed using [this guide](https://www.arduino.cc/en/Tutorial/getting-started-with-ide-v2/ide-v2-board-manager#installing-a-core).
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To learn more about board installation, see [Add boards to Arduino IDE](https://support.arduino.cc/hc/en-us/articles/360016119519-Add-boards-to-Arduino-IDE).
title: "Compilation error: Platform not found: platform not installed"
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id: 360020846379
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---
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When compiling or uploading, the following error may appear in the output panel.
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```
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Compilation error: Platform <platform name> not found: platform not installed
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```
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This error appears when the selected board is not installed.
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Follow these steps:
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1. Check that you've selected the correct board. See [Select board and port in Arduino IDE](https://support.arduino.cc/hc/en-us/articles/4406856349970-Select-board-and-port-in-Arduino-IDE).
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2. If the required board is not installed, install it. See [Add boards to Arduino IDE](https://support.arduino.cc/hc/en-us/articles/360016119519-Add-boards-to-Arduino-IDE).
A `Compilation error: exit status 1` error indicates that the sketch compilation process has failed, and is not related to the upload process. For more information, look at previous lines in the error output.
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For example, check this error output:
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```
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.../core_arduino_samd_mkrwifi1010_dc4ffca0ef28855003b5cc223e78a605.a(main.cpp.o): In function `main':
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.../Arduino15/packages/arduino/hardware/samd/1.8.13/cores/arduino/main.cpp:53: undefined reference to `loop'
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collect2: error: ld returned 1 exit status
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exit status 1
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Compilation error: exit status 1
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```
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The most useful information is ``undefined reference to `loop'``, which occurs because the sketch is missing a correctly defined `loop()` function.
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## Further reading
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*[If your sketch doesn't compile](https://support.arduino.cc/hc/en-us/articles/4402764401554-If-your-sketch-doesn-t-compile)
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title: "Error: exit status 1"
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title: 'About error messages with "exit status"'
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id: 360016955139
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---
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**Exit status 1** is used in some error messages to indicate that a process has finished (or "exited") in failure. Other parts of the error message will often contain more specific information.
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Error messages that occur when Arduino IDE is compiling or uploading a sketch can include an exit status.
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**Exit status 1** indicates that a process has finished (or "exited") in failure. Other parts of the error message will often contain more specific information.
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Your error output may end with one of these lines:
title: "Failed uploading: uploading error: exit status 1"
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---
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`Failed uploading: uploading error: exit status 1` is a generic error message indicating that the upload has failed.
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## Check the console output
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Often preceding lines will contain more specific information. For example:
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```
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No device found on cu.Bluetooth-Incoming-Port
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Failed uploading: uploading error: exit status 1
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```
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In this case the `cu.Bluetooth-Incoming-Port` port was selected by mistake. Since no board is connected to the port, the upload failed. This is indicated by the `No device found on cu.Bluetooth-Incoming-Port` message. The issue can be solved by selecting the right port in the _Tools > Port_ menu.
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## If you're not sure what's causing the error
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Follow these steps:
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1.**Check your connections**. Your board needs to be connected with a data USB cable (charge-only cables will not work). Make sure the cable is fully inserted in the port on each end. Try a different USB cable, and avoid hubs and other adapters if possible. Remove connections to the board pins, especially the **0 (RX)** and **1 (TX)** digital pins.
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2.**Check your board and port selections**. In the top menu bar, make sure the correct board is selected in _Tools > Board_, and that you've selected the right port in _Tools > Port_. Try disconnecting and reconnecting your board if you're unsure which port is being used (close and reopen the Port menu to refresh the list). For more information, see [Select the right port and board](https://support.arduino.cc/hc/en-us/articles/4406856349970-Select-board-and-port).
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3.**Make sure other applications aren't using the port**. Close other instances of the IDE, serial monitors, and any other applications that may be using the port. See [Find and stop process blocking a port](https://support.arduino.cc/hc/en-us/articles/4407830972050-Find-and-stop-process-blocking-a-port).
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## Further reading
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*[Errors when uploading a sketch](https://support.arduino.cc/hc/en-us/articles/4403365313810-Errors-when-uploading-a-sketch)
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