ဘာ
Ššš  Califanya-carifamifa
[[Madhya-lilā Ch 24
The words  sevya   bhagavān  in this verse are important.  Bhagavān  indicates the Supreme Personality of Godhead, Lord Viṣṇu. Lord Viṣṇu alone is worshipable. There is no need to worship demigods. This is confirmed in  Bhagavad-gītā :
kāmais tais tair hrta-jñānāḥ prapadyante ‘nya-devatāḥ taṁ taṁ niyamam āsthāya prakrtvā nivatāḥ svavā
“Those whose minds are distorted by material desires surrender unto demigods and follow the particular rules and regulations of worship according to their own natures.” (Bg. 7.20)
It is also stated in the Skanda Purāna::
vāsudevaṁ parityajya 
    yo ʼanya-devam upāsate 
    svamātaraṁ parityajya 
    śva-pacīṁ vandate hi saḥ
“A person who worships the demigods and gives up Lord Vāsudeva is like a man who gives up the protection of his mother for the shelter of a witch.”
It is also stated in  Bhagavad-gīā  (9.23)::
ye ‘py anya-devatā-bhaktā yajante śraddhayānvitāḥ te ‘pi mām eva kaunteya yajanty avidhi-pūrvakam
“Whatever a man may sacrifice to other gods, O son of Kuntī, is really meant for Me alone, but it is offered without true understanding.”
Demigods are also living entities and parts and parcels of Krṣṇa. Therefore in one sense one worships Krṣṇa when one worships the demigods, but not in the proper way. There is a proper method to water a tree. One should water the roots, but if one waters the leaves and branches instead, he is simply wasting his time. If one worships the demigods to the exclusion of Lord Viṣṇu, his rewards will only be material. As confirmed in  Bhagavad-gītā :
antavat tu phalaṁ teṣāṁ
tad bhavaty alpa-medhasām
devān deva-yajo yānti
mad-bhaktā yānti mām api