IT seems that you are on Windows. I’m on Linux, but, did you try with just your variable and take à look on the result ? Maybe the error will give you more information.
That’s weird. Try adding a property by pressing ad option. You should be able to force it by adding file name there aswell.
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i have this problem too. filename can not dynamically change from formula…
solved by adding double backslash \\
eg
d:\data_folder\\{{yourformula}}.json