Bug in Load()

As reported by @cprodhomme Load() crashes when called with the following parameters:

Load(configfile = NULL, exp = c("b0cm", "b0gq"), grid = NULL, latmax = 75, latmin = 25, leadtimemax = 1, leadtimemin = 1, lonmax = 70, lonmin = 340, maskmod = list(NULL, NULL, NULL), maskobs = list(NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL,     NULL, NULL, NULL, NULL, NULL), method = "conservative", nleadtime = 4, nmember = 10, nmemberobs = NULL, nprocs = NULL, obs = "ERAint", output = "lonlat", sampleperiod = 1, sdates = c("19810501", "19820501", "19830501", "19840501", "19850501", "19860501", "19870501", "19880501", "19890501", "19900501", "19910501", "19920501", "19930501", "19940501", "19950501", "19960501", "19970501", "19980501", "19990501", "20000501", "20010501", "20020501", "20030501", "20040501", "20050501", "20060501", "20070501", "20080501", "20090501", "20100501"), silent = FALSE, storefreq = "monthly", suffixexp = NULL, suffixobs = NULL, var = "g500", varmax = NULL, varmin = NULL)

While works when using s2dverification < 2.3.0