vmcj/max_error_count is a SAP Parameter attribute which is used to control maximum number of errors before the vmc is deactivated information. This is available within R/3 SAP systems depending on the version and release level.
Below is the standard documentation available and a few details of the attributes values .
This option specifies the number of errors which are tolerated during
VMC startup. If more errors occur, the VMC is deactivated. The VMC
can be activated dynamically via transaction SM52 again.
See SAP Parameter Documentation for full SAP documentation for this profile parameter.