Problem with LOCI -Intensity macro for background substraction

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#1

Hello

I want to use the intensity macro for background subtraction from LOCI plugin but I keep getting error windows, I uninstalled FIJI and add the LOCI site in the update but nothing change.
Please, see attach the error window.

Is this plugin working or is it my computer? MAc OSx high sierra.

Thanks in advance for any help
Regards

Pablo 48