You need to determine whether your package needs additional disk space on the target system (space in addition to that required by the package objects). If so, create the space information file. This is different than creating empty files and directories at installation time as discussed in Defining Additional Objects to Be Created at Install Time.
While the pkgadd command ensures that there is enough disk space to install your package based on the object definitions in the pkgmap file, a package may require additional disk space beyond that needed by the objects defined in the pkgmap file. For example, your package might create a file after installation, which may contain a database, log files, or some other growing file that consumes disk space. To be sure that there is space set aside for it, you should include a space file specifying the disk space requirements. The pkgadd command checks for the additional space specified in a space file. Refer to space(4) for more information.
Be certain that your space file has an entry in the prototype file. Its file type should be i (for package information file).