Landlord within their rights to refuse subletting arrangements

Last year, I rented a four-bedroom house with a servant's quarter within my own compound in South C. Since I lost my job in the middle of last year, I've resolved to sublet some rooms and the servants quarter in order to supplement my income. However, the house owner learned of the subletting and has threatened to evict me. I'm not sure what his problem is because I pay him the agreed-upon rent on time.
Pauline from Nairobi