# Implementing Interfaces in clarion 11 ABC

**URL:** <https://clarionhub.com/t/implementing-interfaces-in-clarion-11-abc/8869>\
**Category:** questions\
**Tags:** nettalk, class, abc, c11\
**Created:** [December 19, 2025, 2:46pm UTC](https://clarionhub.com/t/implementing-interfaces-in-clarion-11-abc/8869 "2025-12-19T14:46:28Z")\
**Posts on this page:** 1\
**Showing post:** 6

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**Author:** ![CarlBarnes](https://clarionhub.com/user_avatar/clarionhub.com/carlbarnes/32/1859_2.png) [@CarlBarnes](https://clarionhub.com/u/CarlBarnes)\
**Post date:** [December 19, 2025, 6:08pm UTC](https://clarionhub.com/t/implementing-interfaces-in-clarion-11-abc/8869/6 "2025-12-19T18:08:14Z")

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> [@rjolda](#):
>
> Now I get an ISL error:0

There is this [post on ISL Errors](https://clarionhub.com/t/what-does-internal-error-isl-error-0-mean/267) coding classes. Renaming the Class fixed it.

Google “Clarion ISL Error” there are some others.

Maybe I’m thinking of a different odd error, but adding a new Global variable STRING(255) fixed that by shifting addresses.

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