# Ni string invalid always

**URL:** <https://forums.digi.com/t/ni-string-invalid-always/20855>\
**Category:** XBee - DigiMesh\
**Tags:** xbee-900hp, string, ni\
**Created:** [October 28, 2019, 10:00am UTC](https://forums.digi.com/t/ni-string-invalid-always/20855 "2019-10-28T10:00:16Z")\
**Posts on this page:** 1\
**Page:** 1

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**Author:** ![daveazcarate](https://avatars.discourse-cdn.com/v4/letter/d/85f322/32.png) [@daveazcarate](https://forums.digi.com/u/daveazcarate)\
**Post date:** [October 28, 2019, 10:00am UTC](https://forums.digi.com/t/ni-string-invalid-always/20855/1 "2019-10-28T10:00:16Z")

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hello, I’m new on xbee develop, so I want help, I’m working on node red generating frames to my app, I can send data over digimesh but I don’t want to use the SH and SL because what happen if the coordinator xbee is damaged? I want to change the configuracion on all devices?  
When I try to generate data frames con XCTU no matther what I write always NI String field is on red and tell me “ONE OR MORE API FIELDS ARE NOT CORRECTLY CONFIGURED” SO what I’m doing wrong, I cant generate this frame