# Xojo 2026 1.1 RuntimeError

**URL:** <https://forum.xojo.com/t/xojo-2026-1-1-runtimeerror/88238>\
**Category:** macOS\
**Created:** [May 11, 2026, 2:26pm UTC](https://forum.xojo.com/t/xojo-2026-1-1-runtimeerror/88238 "2026-05-11T14:26:27Z")\
**Posts on this page:** 5\
**Page:** 1

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**Author:** ![Ralf\_Penzler](https://forum.xojo.com/user_avatar/forum.xojo.com/ralf_penzler/32/7187_2.png) [@Ralf\_Penzler](https://forum.xojo.com/u/Ralf_Penzler)\
**Post date:** [May 11, 2026, 2:26pm UTC](https://forum.xojo.com/t/xojo-2026-1-1-runtimeerror/88238/1 "2026-05-11T14:26:27Z")

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I get the following error message when I launch my project in the IDE Xojo 2026 1.1. Until now, I’ve been able to launch the project in Xojo 2025 3.1 without any problems.

> Location: Common/ObjectModel/RuntimeObjectFoundation.cpp:344  
> Condition: out-\>events.count \>= base-\>events.count

Does anyone have any ideas?

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**Author:** ![Ralf\_Penzler](https://forum.xojo.com/user_avatar/forum.xojo.com/ralf_penzler/32/7187_2.png) [@Ralf\_Penzler](https://forum.xojo.com/u/Ralf_Penzler)\
**Post date:** [May 11, 2026, 2:38pm UTC](https://forum.xojo.com/t/xojo-2026-1-1-runtimeerror/88238/2 "2026-05-11T14:38:07Z")

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I eventually realized that the problem was a library I had created in Xojo. After replacing the library with the original classes, the app launched.

Xojo’s library feature has caused nothing but trouble so far.

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**Author:** ![Anthony\_G\_Cyphers](https://forum.xojo.com/user_avatar/forum.xojo.com/anthony_g_cyphers/32/16862_2.png) [@Anthony\_G\_Cyphers](https://forum.xojo.com/u/Anthony_G_Cyphers)\
**Post date:** [May 11, 2026, 2:42pm UTC](https://forum.xojo.com/t/xojo-2026-1-1-runtimeerror/88238/3 "2026-05-11T14:42:45Z")

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Changes were made in 2026r1.1 that may require rebuilding libraries for that version. There are likely going to be such changes fairly frequently while the feature stabilizes.

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**Author:** ![Ralf\_Penzler](https://forum.xojo.com/user_avatar/forum.xojo.com/ralf_penzler/32/7187_2.png) [@Ralf\_Penzler](https://forum.xojo.com/u/Ralf_Penzler)\
**Post date:** [May 11, 2026, 2:57pm UTC](https://forum.xojo.com/t/xojo-2026-1-1-runtimeerror/88238/4 "2026-05-11T14:57:24Z")

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Thanks for the information. I’ll stay away from the libraries for now. I also have software that keeps parts of Xojo projects in sync.

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**Author:** ![Tim\_Parnell](https://forum.xojo.com/user_avatar/forum.xojo.com/tim_parnell/32/161_2.png) [@Tim\_Parnell](https://forum.xojo.com/u/Tim_Parnell)\
**Post date:** [May 11, 2026, 4:06pm UTC](https://forum.xojo.com/t/xojo-2026-1-1-runtimeerror/88238/5 "2026-05-11T16:06:05Z")

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> [@Ralf\_Penzler](#):
>
> Xojo’s library feature has caused nothing but trouble so far.

This is what I have been trying to warn people about but everyone’s been dismissing me.