Rachid, do you have either the MODELING or CONTENT_ADMIN role assigned to you? The reason I ask is that either of these roles should allow you access to _SYS_BIC schema. Although they both contain an analytic privilege called _SYS_BI_CP_ALL which for some could be considered too much access. In our case we have created a custom new role that allows both _SYS_BIC and _SYS_BI and REPOSITORY_REST access but without the powerful _SYS_BI_CP_ALL as only a select few have these predefined roles at my organization.
-Patrick