I do not understand why i cannot use Pellet in google colab. Moreover, When I try to execute Hermit, this works. So, it is a problem just with pellen in google colab. Moreover, the file with all the triples does not have anything wrongs, since it is the same that i use locally and Pellet work well here.
I do not have done anything, it is porblem of google colab that some times the machines have some wrong things, what you have to do is wait until google colab give you another machine.
I am getting a very similar error not in Colab but using Pycharm.
raise OwlReadyJavaError("Java error message is:\n%s" % (e.stderr or e.output or b"").decode("utf8"))
owlready2.base.OwlReadyJavaError: Java error message is:
log4j:WARN No appenders could be found for logger (com.hp.hpl.jena.sparql.mgt.ARQMgt).
log4j:WARN Please initialize the log4j system properly.
log4j:WARN See http://logging.apache.org/log4j/1.2/faq.html#noconfig for more info.
Unknown concept type: literal(true,(),http://www.w3.org/2001/XMLSchema#boolean)
Use -v for detail.