# Key error on Overlay load

**URL:** <https://discuss.pynq.io/t/key-error-on-overlay-load/3043>\
**Category:** Support\
**Created:** [September 17, 2021, 10:58pm UTC](https://discuss.pynq.io/t/key-error-on-overlay-load/3043 "2021-09-17T22:58:08Z")\
**Posts on this page:** 1\
**Showing post:** 2

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**Author:** ![jancumps](https://sea1.discourse-cdn.com/flex019/user_avatar/discuss.pynq.io/jancumps/32/2140_2.png) [@jancumps](https://discuss.pynq.io/u/jancumps)\
**Post date:** [September 18, 2021, 9:36am UTC](https://discuss.pynq.io/t/key-error-on-overlay-load/3043/2 "2021-09-18T09:36:45Z")

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I used this blog to define a working interrupt: [An Example for the PYNQ Interrupt Subsystem](https://discuss.pynq.io/t/zynq-ps7-interrupts/198/2)

The advise is to use an AXI Interrupt Controller:  
 ![image](https://us1.discourse-cdn.com/flex019/uploads/pynq1/original/2X/c/cd42c80f3ebf00966a572fc9668134c584e5f43f.png)

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