I think you really should read aguirRe's tool tip s(link provided by Megalodon). And try to follow some of the basic advices written in there: this file can be considered as the Holy Bible for Quake Mappers.
If you have any troubles, you can also ask to func_ Quake forum that has a very good mappers community (i.e Func_Msgboard: Mapping Help
Also, I am pretty sure some entities supported in HL are not supported in Quake, hence the error you have.. I think a bit of work is awaiting for you..