Error in eval(predvars, data, env) : object 'voxel1con_images' not found

[BenedettaCecconi]

Hello,

I'm trying to run the function lmervoxel on SPM-generated 1st level contrast images. I keep getting this error and I don't know where this variable "voxel1..." comes from. I input con_images (my dependent variable) as paths to the lmervoxel function, together with a mask and covariates:

Loop over each subject and session

for (i in 1:length(con_images)) {
Select the NIfTI image path for the current subject

current_image_path <- con_paths[[i]]
Call the lmerVoxel function with the selected image path

lmerVoxel(image = current_image_path, mask = mask_path, fourdOut = fourd_out_path,
formula = formula,
subjData = cov_reduced_data, mc.preschedule = TRUE, ncores = 1)
}

Each con_image is an image array double:

the formula I use is the following:

formula <- "con_images ~ Group + Propofol_Concentration + Gender + (1 + session| Subjects) + (1 + Subjects| Propofol_Concentration)"

When I run the code, it says:

[1] "Created time series to matrix"
[1] "Created formula list"
[1] "Running test model"
Error in eval(predvars, data, env) : object 'voxel1con_images' not found

Can someone help, please?

Thanking a lot in advance,

Benedetta