[GRASS-user] Error in category file index

'Hello,
I got the following message in an attempt to spilt up a 1million line into points:

v.to.points -v -t input=v37bz2vector1000000@Nederland output=v37bz2point1000000 type=point,line,boundary,centroid llayer=1 dmax=1000 --overwrite

Vector map already exists and will be overwritten
Building topology …
Registering lines: 1000 2000 3000 4000 5000 6000 7000 8000 9000 10000 11000 12000 13000 14000 15000 16000 17000 18000 19000 20000 21000 22000 23000 24000 25000 26000 27000 28000 29000 30000 31000 32000 33000 34000 35000 36000 37000 38000 39000 40000 41000 42000 43000 44000 45000 46000 47000 48000 49000 50000 51000 52000 53000 54000 55000 56000 57000 58000 59000 60000 61000 62000 63000 64000 65000 66000 67000 68000 69000 70000 71000 72000 73000 74000 75000 76000 77000 78000 79000 80000 81000 82000 83000 84000 85000 86000 87000 88000 89000 90000 91000 92000 93000 94000 95000 96000 97000 98000 99000 100000 101000 102000 103000 104000 105000 106000 107000 108000 109000 110000 111000 112000 113000 114000 115000 116000 117000 118000 119000 120000 121000 122000 123000 124000 125000 126000 127000 128000 129000 130000 131000 132000 133000 134000 135000 136000 137000 138000 139000 140000 141000 142000 143000 144000 145000 146000 147000 148000 149000 150000 151000 152000 153000 154000 155000 156000 157000 158000 159000 160000 161000 162000 163000 164000 165000 166000 167000 168000 169000 170000 171000 172000 173000 174000 175000 176000 177000 178000 179000 180000 181000 182000 183000 184000 185000 186000 187000 188000 189000 190000 191000 192000 193000 194000 195000 196000 197000 198000 199000 200000 201000 202000 203000 204000 205000 206000 207000 208000 209000 210000 211000 212000 213000 214000 215000 216000 217000 218000 219000 220000 221000 222000 223000 224000 225000 226000 227000 228000 229000 230000 231000 232000 233000 234000 235000 236000 237000 238000 239000 240000 241000 242000 243000 244000 245000 246000 247000 248000 249000 250000 251000 252000 253000 254000 255000 256000 257000 258000 259000 260000 261000 262000 263000 264000 265000 266000 267000 268000 269000 270000 271000 272000 273000 274000 275000 276000 277000 278000 279000 280000 281000 282000 283000 284000 285000 286000 287000 288000 289000 290000 291000 292000 293000 294000 295000 296000 297000 298000 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871000 872000 873000 874000 875000 876000 877000 878000 879000 880000 881000 882000 883000 884000 885000 886000 887000 888000 889000 890000 891000 892000 893000 894000 895000 896000 897000 898000 899000 900000 901000 902000 903000 904000 905000 906000 907000 908000 909000 910000 911000 912000 913000 914000 915000 916000 917000 918000 919000 920000 921000 922000 923000 924000 925000 926000 927000 928000 929000 930000 931000 932000 933000 934000 935000 936000 937000 938000 939000 940000 941000 942000 943000 944000 945000 946000 947000 948000 949000 950000 951000 952000 953000 954000 955000 956000 957000 958000 959000 960000 961000 962000 963000 964000 965000 966000 967000 968000 969000 970000 971000 972000 973000 974000 975000 976000 977000 978000 979000 980000 981000 982000 983000 984000 985000 986000 987000 988000 989000 990000 991000 992000 993000 994000 995000 996000 997000 998000 999000
999999 primitives registered
Building areas:

0 areas built
0 isles built
Attaching islands:
Attaching centroids:

Topology was built.
Number of nodes : 999987
Number of primitives: 999999
Number of points : 999999
Number of lines : 0
Number of boundaries: 0
Number of centroids : 0
Number of areas : 0
Number of isles : 0

Error writing out category index file <F:/_Geo-Informatie/Hoogte_informatie/AHN/Grass/Nederland/Nederland/vector/v37bz2point1000000/cidx>

[999999] points written to output vector map

I use the native windows version 6.3

Does any body have any idea what the reason can be?
Regards
Vriendelijke groeten,
Chris Nelis
Gemeente Vlaardingen
sectie Geo informatie
tel.: 010-248 47 25
Hoflaan 43, 3134 AC Vlaardingen
Postbus 1002, 3130 EB Vlaardingen