error on deployed crystal report

i want to deployed the crystal report on azure website but after the deployement comes error on crystal report 

Could not load file or assembly 'log4net, Version=1.2.10.0, Culture=neutral, PublicKeyToken=692fbea5521e1304' or one of its dependencies. The located assembly's manifest definition does not match the assembly reference. Exception from HRESULT: 0x80131040

please help me