Have you tried under actual #CSpect V2.15.2 with SystemNextMaster from https://gitlab.com/thesmog358/tbblue/-/tree/master ? I still get this error, even with ROADKILL_2022a.bas. Or do you only program/test on "real Hardware ZX Spectrum Next"?
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Doh! :o
I have just updated the files (zip file, and the documentation files). This should now have resolved that one little niggly problem.
This pops up when people are running the newer Core and NextBASIC 2.07. Both CSpect and Real Hardware actually work fine, but that is with the previous firmware (ie. NextBasic 2.06 ) - however it is thankfully an easy fix.
DIY approach : The line itself is thankfully an easy fix if you want to edit it rather than download. Just go to line 2955. Find the %INT{dX} and remove the %INT and {} so its just dX.
Line 1 has the save statement you can use to save it back to the SD / Disk.