Failed to open a session for the virtual machine vm

Failed to open a session for the virtual machine vm .

Could not open the medium ‘/Users/macuser/VirtualBox VMs/vm/HDP_2.6.5_vmware_85-disk1.vmdk’ .

VMDK: inconsistency between grain table and backup grain table in ‘/Users/macuser/VirtualBox VMs/vm/HDP_2.6.5_vmware_85-disk1.vmdk’ (VERR_VD_VMDK_INVALID_HEADER).

VD: error VERR_VD_VMDK_INVALID_HEADER opening image file ‘/Users/macuser/VirtualBox VMs/vm/HDP_2.6.5_vmware_85-disk1.vmdk’ (VERR_VD_VMDK_INVALID_HEADER).

Result Code: NS_ERROR_FAILURE (0x80004005)
Component: MediumWrap
Interface: IMedium {4afe423b-43e0-e9d0-82e8-ceb307940dda}

how do i fix this ?