while converting c to hex file it is showing that target cant be created?can anybody say me what will the problem be?
What's the error, and what's the file that you're attempting to create?
Does the directory exist, does the file or directory contain spaces, or other characters that might be illegal in the OS being used? Is the directory read-only? Is the file open somewhere else?
Does the linker complete?
What OS are you using? What version of the tools?
Show the error, show the context.
Yes: the tools (compiler, linker, etc) provide messages which tell you what problem(s) they have encountered - and where.
Read those messages, and fix the problems so reported.
http://www.keil.com/support/man/docs/uv4/uv4_ca_buildproject.htm