# system.opcua.callMethod throws ClassCastException when invoking with arguments

**URL:** <https://forum.inductiveautomation.com/t/system-opcua-callmethod-throws-classcastexception-when-invoking-with-arguments/87964>\
**Category:** Ignition\
**Tags:** ignition81, scripting\
**Created:** [March 27, 2024, 1:21pm UTC](https://forum.inductiveautomation.com/t/system-opcua-callmethod-throws-classcastexception-when-invoking-with-arguments/87964 "2024-03-27T13:21:49Z")\
**Posts on this page:** 1\
**Showing post:** 5

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**Author:** ![Kevin.Herron](https://sea1.discourse-cdn.com/inductiveautomation/user_avatar/forum.inductiveautomation.com/kevin.herron/32/7259_2.png) [@Kevin.Herron](https://forum.inductiveautomation.com/u/Kevin.Herron)\
**Post date:** [March 27, 2024, 1:32pm UTC](https://forum.inductiveautomation.com/t/system-opcua-callmethod-throws-classcastexception-when-invoking-with-arguments/87964/5 "2024-03-27T13:32:13Z")

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Oh... I don't expect this to work then. Both of those Python OPC UA implementations are [broken](https://forum.inductiveautomation.com/t/error-calling-opc-ua-method/83234) and they don't seem to care or respond to my bug reports.

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