# java.lang.NullPointerException **URL:** \ **Category:** KNIME Analytics Platform\ **Created:** [August 24, 2018, 6:16am UTC](https://forum.knime.com/t/java-lang-nullpointerexception/11900 "2018-08-24T06:16:25Z")\ **Posts on this page:** 8\ **Page:** 1
**Author:** ![sebastianengelmann](https://forum-cdn.knime.com/letter_avatar_proxy/v4/letter/s/a587f6/32.png) [@sebastianengelmann](https://forum.knime.com/u/sebastianengelmann)\ **Post date:** [August 24, 2018, 6:16am UTC](https://forum.knime.com/t/java-lang-nullpointerexception/11900/1 "2018-08-24T06:16:25Z")
Hello everybody, I get a java.lang.NullPointerException when I try to open an existing workflow in the KNIME Explorer. I found out that a meta node in the workflow cause the fault. If I delete the folder of the metanode I can open the workflow. Is there a chance to restore the complete workflow without losing the metanode causing the fault? [NullPointerException.log](https://forum-cdn.knime.com/uploads/default/original/2X/a/afec0dceb195bb5156c3d38fb7f5d675c69390e1.log) (35.7 KB) Many greetings ---
**Author:** ![marten\_kose](https://forum-cdn.knime.com/letter_avatar_proxy/v4/letter/m/a87d85/32.png) [@marten\_kose](https://forum.knime.com/u/marten_kose)\ **Post date:** [August 27, 2018, 12:03pm UTC](https://forum.knime.com/t/java-lang-nullpointerexception/11900/2 "2018-08-27T12:03:07Z")
Hi Sebastian, Can you share the workflow with us? Cheers, Marten ---
**Author:** ![sebastianengelmann](https://forum-cdn.knime.com/letter_avatar_proxy/v4/letter/s/a587f6/32.png) [@sebastianengelmann](https://forum.knime.com/u/sebastianengelmann)\ **Post date:** [August 27, 2018, 1:29pm UTC](https://forum.knime.com/t/java-lang-nullpointerexception/11900/3 "2018-08-27T13:29:08Z")
Hello Marten, unfortunately that is not possible cause the data is confidential. I wrote you an email. Best regards Sebastian ---
**Author:** ![navinjadhav](https://forum-cdn.knime.com/user_avatar/forum.knime.com/navinjadhav/32/7089_2.png) [@navinjadhav](https://forum.knime.com/u/navinjadhav)\ **Post date:** [October 9, 2019, 11:04am UTC](https://forum.knime.com/t/java-lang-nullpointerexception/11900/4 "2019-10-09T11:04:47Z")
Hello Team i am also facing the same issue, i got notification - updates available i installed updates from onwards i cant connect to the server from knime AP. ![image](https://forum-cdn.knime.com/uploads/default/original/2X/3/340764db678c2bd77d81556e91a394764c6f28e9.png) ![image](https://forum-cdn.knime.com/uploads/default/original/2X/f/f0aa241ea28b26b4df646e092543d0f9c842b622.png) ---
**Author:** ![navinjadhav](https://forum-cdn.knime.com/user_avatar/forum.knime.com/navinjadhav/32/7089_2.png) [@navinjadhav](https://forum.knime.com/u/navinjadhav)\ **Post date:** [October 9, 2019, 11:06am UTC](https://forum.knime.com/t/java-lang-nullpointerexception/11900/5 "2019-10-09T11:06:10Z")
![image](https://forum-cdn.knime.com/uploads/default/original/2X/f/f2d2f57c5cb4c4c577ffaed107d14ec73767a200.png) ---
**Author:** ![marten\_kose](https://forum-cdn.knime.com/letter_avatar_proxy/v4/letter/m/a87d85/32.png) [@marten\_kose](https://forum.knime.com/u/marten_kose)\ **Post date:** [October 9, 2019, 2:23pm UTC](https://forum.knime.com/t/java-lang-nullpointerexception/11900/6 "2019-10-09T14:23:50Z")
Hi @navinjadhav, this is what I got: You updated your client KNIME AP to the latest versions (4.0.2) and now you can not connect to the server anymore. What is the server version you try to connect to (please share both version numbers, server and executor). Can you additionally share your local logs with us? Best, Marten ---
**Author:** ![navinjadhav](https://forum-cdn.knime.com/user_avatar/forum.knime.com/navinjadhav/32/7089_2.png) [@navinjadhav](https://forum.knime.com/u/navinjadhav)\ **Post date:** [October 10, 2019, 6:00am UTC](https://forum.knime.com/t/java-lang-nullpointerexception/11900/7 "2019-10-10T06:00:45Z")
server 4.9 as of now i installed new AP and its working ---
**Author:** ![system](https://forum-cdn.knime.com/uploads/default/original/1X/ab3ccf34482a0329361734a18199390177204f15.png) [@system](https://forum.knime.com/u/system)\ **Post date:** [June 23, 2023, 8:30pm UTC](https://forum.knime.com/t/java-lang-nullpointerexception/11900/8 "2023-06-23T20:30:38Z")