# Re-building base overlay PYNQ 2.5.4

**URL:** <https://discuss.pynq.io/t/re-building-base-overlay-pynq-2-5-4/6911>\
**Category:** Support\
**Created:** [April 11, 2024, 7:23pm UTC](https://discuss.pynq.io/t/re-building-base-overlay-pynq-2-5-4/6911 "2024-04-11T19:23:22Z")\
**Posts on this page:** 1\
**Page:** 1

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**Author:** ![Fatima\_Alhosani](https://sea1.discourse-cdn.com/flex019/user_avatar/discuss.pynq.io/fatima_alhosani/32/5763_2.png) [@Fatima\_Alhosani](https://discuss.pynq.io/u/Fatima_Alhosani)\
**Post date:** [April 11, 2024, 7:23pm UTC](https://discuss.pynq.io/t/re-building-base-overlay-pynq-2-5-4/6911/1 "2024-04-11T19:23:22Z")

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I am using PYNQ-Z2 Board  
PYNQ Image V2.5.4 since I have Vivado 2019.2

I am trying to rebuild the base overlay  
but I keep running into this error:  
Skipping building color\_convert  
Checking color\_convert  
can’t unset “period”: no such variable

everytime I put in the tcl command line source ./build\_base\_ip.tcl

Any idea on how to fix this ?