Comparing 2 NDVI images

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Hi,

I would like to comparise two NDVI images of the same area, acquired from Sentinel 2 Level 2 products.
After collocation, when I try to open any band in collocated product, the error shows up:

_Failed to open image view. _
expression: Undefined symbol ‘ndvi_flags_M.NDVI_ARITHMETIC_M’.

There are 5 bands in collocated product: ndvi_M, ndvi_flags_M, ndvi_S, ndvi_flags_S, collocation_flags. The same error for each of them.

Besides that error, what expression would you recommend to use in ‘band maths’ later, to show the differences between two ndvi’s? Something like (ndvi_M-ndvi_S)/(ndvi_M) ?

Thanks in advance, Wojciech