Issues importing a mask made in ChimeraX

Hi all,

I’m having issues importing a mask into cryoSPARC version 3.3.2. I made the mask using the following commands in ChimeraX:

vop threshold #volume minimum 0.18 set 0
vop threshold #volume maximum 0.1 setMaximum 1
save cryosparc_P18_J187_007_volume_mask_0.1.mrc #volume

In CryoSPARC, I try to import this mask using Import 3D volumes and changing the type of volume being imported to mask. However, I keep getting the error:

[CPU: 209.0 MB] Traceback (most recent call last):
File “cryosparc_master/cryosparc_compute/”, line 85, in
File “/home/satori-csparc/cryosparc/cryosparc_master/cryosparc_compute/jobs/imports/”, line 580, in run_import_volumes
hdr, data = mrc.read_mrc(far_import_path)
File “/home/satori-csparc/cryosparc/cryosparc_master/cryosparc_compute/blobio/”, line 124, in read_mrc
header = read_mrc_header(file_obj, debug_fname=fname)
File “/home/satori-csparc/cryosparc/cryosparc_master/cryosparc_compute/blobio/”, line 43, in read_mrc_header
assert len(header_int32) == 256, f"Could not read mrc header from {debug_fname}"
AssertionError: Could not read mrc header from /nobackup/users/vasquezs/cryosparc/P18/imports/cryosparc_P18_J187_007_volume_mask.mrc

Does anyone know how to resolve this issue? Can it be how I created the mask? Thank you in advance!