Need some help about PTY

Hi . when i entered the command in my chrooted environment expect -c spawn ls it displayed the message The system has no more ptys. Ask your system administrator to create more Then i tried the same command in my host system (fedora core 3) .It

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Hi . This problem occurred when i was building LFS when i entered the command in my chrooted environment expect -c spawn ls it displayed the message The system has no more ptys. Ask your system administrator to create more Then i tried