Error when clicking Act as Proxy

Hi Experts,

When we try to go to 'Act as proxy' under compensation we are encountering below error message.

We are using custom roles and we are sure we do have the ff privileges:

• Workforce Compensation Act as Proxy (ORA_CMP_MANAGE_WORKFORCE_COMPENSATINO_WHEN_ACTING_AS_PROXY)
• Manage Workforce Compensation Work Area by Proxy (CMP_MANAGE_WORKFORCE_COMPENSATION_WORK_AREA_BY_PROXY_PRIV)
• Privilege for Proxy User (FND_IDP_PROXY_USER_PRIV)
• Impersonate User (FND_IMPERSONATE_USER_PRIV)
  

Can someone help us on what might be causing this?