Thank you Rafael Reuber i will try these commands...

Mr.Rafael Reuber when try this sh openerp-server -d yourdbname -u crm it shows openerp-server: 2: openerp-server: import: not found openerp-server: 5: openerp-server: Syntax error: Bad function name

b_unit is a field created by me in crm.py also in crm_lead.py

How did you create it - Paste your code. Did you updated your OpenERP instance recently ?

I created as a field in crm_lead.py file.I updated OpenERP instance recently 'B_unit':fields.many2one('crm.case.businessunit','Business Unit',required=True),

When you update, the core file and the addons files are updated (including the crm module), this means that probably the changes you made in crm_lead.py are lost.