# Unsupported types for BAnd: 'null' and 'java.lang.Long'

**URL:** <https://forum.inductiveautomation.com/t/unsupported-types-for-band-null-and-java-lang-long/57111>\
**Category:** Ignition\
**Tags:** vision, scripting, ignition81\
**Created:** [March 11, 2022, 2:41pm UTC](https://forum.inductiveautomation.com/t/unsupported-types-for-band-null-and-java-lang-long/57111 "2022-03-11T14:41:33Z")\
**Posts on this page:** 1\
**Showing post:** 2

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**Author:** ![Brianw\_Wolowich](https://sea1.discourse-cdn.com/inductiveautomation/user_avatar/forum.inductiveautomation.com/brianw_wolowich/32/32743_2.png) [@Brianw\_Wolowich](https://forum.inductiveautomation.com/u/Brianw_Wolowich)\
**Post date:** [March 11, 2022, 2:53pm UTC](https://forum.inductiveautomation.com/t/unsupported-types-for-band-null-and-java-lang-long/57111/2 "2022-03-11T14:53:02Z")

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I did find this in another post. Can I use 'try()' in a binding?  
Or is this something I can just ignore as it only shows up in Designer?

> [@Binding Errors at Design Time](https://forum.inductiveautomation.com/t/binding-errors-at-design-time/34233/5):
>
> The root cause is that tag bindings in a Vision Client don’t have a value when they start–there’s a gateway round-trip that must happen at startup. Expressions must immediately return an answer, so tags are null or sometimes `-1` . The `try()` function is the simplest way to get past the problem.

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