qmail not sent/ user cann’t login

Can any one help, i not every good with qmail. But my qmail cann’t sent out email or not let user login to check email. Here the error that I look into the error log:

qmail: 1057695401.588731 status: local 2/10 remote 2/20

qmail: 1057695401.590145 delivery 950: deferral: Trouble_reading_users/cdb_in_qmail-lspawn./

qmail: 1057695401.590255 status: local 1/10 remote 2/20

qmail: 1057695401.590547 delivery 951: deferral: Trouble_reading_users/cdb_in_qmail-lspawn./

Please help I really need fix this. I search on web, but there is any info about this. Any can help then be greats

thanksssss