# In booting Failed to start PYNQ PL Server

**URL:** <https://discuss.pynq.io/t/in-booting-failed-to-start-pynq-pl-server/3576>\
**Category:** Support\
**Created:** [January 23, 2022, 4:39pm UTC](https://discuss.pynq.io/t/in-booting-failed-to-start-pynq-pl-server/3576 "2022-01-23T16:39:37Z")\
**Posts on this page:** 4\
**Page:** 1

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**Author:** ![Yafeng\_Yang](https://sea1.discourse-cdn.com/flex019/user_avatar/discuss.pynq.io/yafeng_yang/32/2743_2.png) [@Yafeng\_Yang](https://discuss.pynq.io/u/Yafeng_Yang)\
**Post date:** [January 23, 2022, 4:39pm UTC](https://discuss.pynq.io/t/in-booting-failed-to-start-pynq-pl-server/3576/1 "2022-01-23T16:39:37Z")

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Hi All,

I have a PYNQ Z2 board.  
When starting the board, it displays only one error message below：

```
  [OK] Started LSB: Load kernel modules needed to enable cpufreq scaling.
              Starting LSB: set CPUFreq kernel parameters...
  [FAILED] Failed to start PYNQ PL Server.
  See 'systemctl status pl_server.service' for details.
  [DEPEND] Dependency failed for Executing boot.py from the boot partition.
  [OK] Started LSB: set CPUFreq kernel parameters.

```

and I have no idea about that.  
Here are the partial screenshot.Everything else is OK but this below.

 ![2{H(JE}GDXOT9EN~N@1T4J](https://us1.discourse-cdn.com/flex019/uploads/pynq1/original/2X/4/431092a8de460af2abbb8cd3917b921c7f3995df.png)  
 ![1@QXAL($ZKDK$HADQZ1WKO0](https://us1.discourse-cdn.com/flex019/uploads/pynq1/original/2X/e/e51688c302ceb134ecc6865d0958b00d4275e979.png)

What could be the reason and what should I do?

Thanks in advance.

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<div class="post-metadata">

**Author:** ![jancumps](https://sea1.discourse-cdn.com/flex019/user_avatar/discuss.pynq.io/jancumps/32/2140_2.png) [@jancumps](https://discuss.pynq.io/u/jancumps)\
**Post date:** [January 23, 2022, 7:26pm UTC](https://discuss.pynq.io/t/in-booting-failed-to-start-pynq-pl-server/3576/2 "2022-01-23T19:26:32Z")

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There is a hint in the bitmaps you posted.  
The service is complaining that a particular file can’t be opened?. The file name is cut off in the bitmap. What is the full message?

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**Author:** ![Yafeng\_Yang](https://sea1.discourse-cdn.com/flex019/user_avatar/discuss.pynq.io/yafeng_yang/32/2743_2.png) [@Yafeng\_Yang](https://discuss.pynq.io/u/Yafeng_Yang)\
**Post date:** [January 24, 2022, 5:09am UTC](https://discuss.pynq.io/t/in-booting-failed-to-start-pynq-pl-server/3576/3 "2022-01-24T05:09:50Z")

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I’m a college student right now,as well as a beginner to learn pynq.  
I’m learning about the project of composable pipeline, but there was another problem before because my pynq version is 2.7.0. I got the answer in another support question (pynq 2.6.2 is required), and there is no SD card reader around me, so I directly uninstall 2.7.0 in terminal and install 2.6.2 through pip.  
So I wonder if it is because of these problems, because everything is normal when the above operations have not been done before.

 ![PCJ(`Z3789ET6(GMIYO5](https://us1.discourse-cdn.com/flex019/uploads/pynq1/original/2X/6/69287227ea61fbf4648e91b49cc41135026af4de.png)

 ![35L)O{QZ5`)@)HD(C$CK](https://us1.discourse-cdn.com/flex019/uploads/pynq1/original/2X/c/c106f39f4fd467c1c15af02a9d5ef7b640c5debf.png)

The error message above is the full message I can get.

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<div class="post-metadata">

**Author:** ![marioruiz](https://sea1.discourse-cdn.com/flex019/user_avatar/discuss.pynq.io/marioruiz/32/2177_2.png) [@marioruiz](https://discuss.pynq.io/u/marioruiz)\
**Post date:** [January 24, 2022, 10:13am UTC](https://discuss.pynq.io/t/in-booting-failed-to-start-pynq-pl-server/3576/4 "2022-01-24T10:13:10Z")

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I suggest you reburn the SD card, this message seems to be related to the downgrading the pynq package.