problem with making tags with tool.....

[shortysk8monkey]

im having another problem with tool, when i type in: tool structure levels\splinter splinter, it says this:
building intermediate geometry....
building collision geometry....
### ERROR edge #30 is open (red)
### ERROR edge #54 is open (red)
### ERROR edge #68 is open (red)
### ERROR edge #70 is open (red)
### ERROR edge #674 is open (red)
### ERROR edge #1028 is open (red)
### ERROR edge #1028 is open (red)
### ERROR edge #2859 is open (red)
### ERROR edge #2868 is open (red)
### ERROR edge #3289 is open (red)
### ERROR failed to build collision geometry.
### ERROR failed to import collision bsp.

can someone please help me, ive been tryin to make a map, but this is one of the many problems ive been having