# Unexpected response code from device: 503

**URL:** <https://forum.genieacs.com/t/unexpected-response-code-from-device-503/1458>\
**Category:** Uncategorized\
**Created:** [February 16, 2021, 11:57am UTC](https://forum.genieacs.com/t/unexpected-response-code-from-device-503/1458 "2021-02-16T11:57:34Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![snuz](https://avatars.discourse-cdn.com/v4/letter/s/9f8e36/32.png) [@snuz](https://forum.genieacs.com/u/snuz)\
**Post date:** [February 16, 2021, 11:57am UTC](https://forum.genieacs.com/t/unexpected-response-code-from-device-503/1458/1 "2021-02-16T11:57:34Z")

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Today, I have another big problem. With the FritzBox 7530 and 7590 it doesn’t work GenieACS.  
If I try to refresh nothing happens or I get `Unexpected response code from device: 503`  
I can’t understand why…I tried to restart all the services, reset and reboot the router but when I try to refresh for allow it to get the configuration it doesn’t work

I found it this on the logs:  
`2021-02-16T12:03:43.430Z [ERROR] Uncaught exception; pid=18857 exceptionName="TypeError" exceptionMessage="Cannot read property 'add' of undefined" exceptionStack="TypeError: Cannot read property 'add' of undefined\n at func (/usr/lib/node_modules/genieacs/lib/session.js:1572:55)\n at func (/usr/lib/node_modules/genieacs/lib/session.js:1587:22)\n at func (/usr/lib/node_modules/genieacs/lib/session.js:1587:22)\n at func (/usr/lib/node_modules/genieacs/lib/session.js:1587:22)\n at func (/usr/lib/node_modules/genieacs/lib/session.js:1587:22)\n at func (/usr/lib/node_modules/genieacs/lib/session.js:1587:22)\n at func (/usr/lib/node_modules/genieacs/lib/session.js:1587:22)\n at func (/usr/lib/node_modules/genieacs/lib/session.js:1587:22)\n at func (/usr/lib/node_modules/genieacs/lib/session.js:1587:22)\n at func (/usr/lib/node_modules/genieacs/lib/session.js:1587:22)"`

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<div class="post-metadata">

**Author:** ![zaidka](https://yyz1.discourse-cdn.com/flex035/user_avatar/forum.genieacs.com/zaidka/32/9_2.png) [@zaidka](https://forum.genieacs.com/u/zaidka)\
**Post date:** [February 23, 2021, 11:20pm UTC](https://forum.genieacs.com/t/unexpected-response-code-from-device-503/1458/2 "2021-02-23T23:20:07Z")

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The exception is likely because in one of your scripts you have a typo in one of the attribute names (e.g. path, value). This has been addressed in 1.2 where if you pass invalid attribute names it wouldn’t cause the process to crash.