[isabelle] cannot run sledgehammer


I have just installed the E prover (downloaded it from the Isabelle site)
on my computer under Linux. When I try to run sledgehammer from proof general,
I get the following error:

*** SysErr ("fork failed", SOME ENOMEM)
*** At command "sledgehammer"

In my setting file, I have

E_HOME=$(choosefrom "$ISABELLE_HOME/contrib/E/E/x86-linux/" "")

Thanks in advance for any help with this,

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