Error in vignettes

The vignette AgriculturalIndicators.Rmd (https://earth.bsc.es/gitlab/es/csindicators/-/blob/master/vignettes/AgriculturalIndicators.Rmd) returns error at the following code:

c(prlr_exp, prlr_obs) %<-% CST_Load(var = 'prlr', 
                                    exp = list(S5path_prlr), 
                                    obs = list(path_ERA5prlr_CDS), 
                                    sdates = sdates, 
                                    lonmax = 353, lonmin = 352.25,
                                    latmax = 41.75, latmin = 41, 
                                    storefreq = 'daily', 
                                    leadtimemin = 1, leadtimemax = 214, 
                                    nmember = 3, output = "lonlat", 
                                    grid = "r1440x721", method = 'bicubic')

In WS_R/3.6.1, it returns:

Error: invalid %<-% right-hand side, incorrect number of values

sessionInfo()
other attached packages:
 [1] s2dv_1.1.0              zeallot_0.1.0           CSTools_4.0.1          
 [4] easyVerification_0.4.4  SpecsVerification_0.5-2 qmap_1.0-4             
 [7] fitdistrplus_1.0-14     npsurv_0.4-0            lsei_1.2-0             
[10] survival_3.2-11         MASS_7.3-51.4           maps_3.3.0             
[13] CSIndicators_0.0.1     

In Nord3v2_R/4.1.2, it returns:

Error in prod(dim_obs) : invalid 'type' (list) of argument

sessionInfo()
other attached packages:
 [1] s2dv_1.1.0              zeallot_0.1.0           CSTools_4.0.1          
 [4] easyVerification_0.4.4  SpecsVerification_0.5-3 qmap_1.0-4             
 [7] fitdistrplus_1.1-8      survival_3.3-1          MASS_7.3-56            
[10] maps_3.4.0