a friend of mine found the solution,
you have to go to User/License/ go to robot type
go to See More and check how many licensed machines are there
definitely appears 2 times like here
you have to make the one with robot = 1 turn green and disable the other one
probably to do this you have to delete and re-create the machine
hope it works 
Anil_G
ashokkarale
jinal.shah
Gautham_Pattabiraman
postwick
chandreshsinh.jadeja
vrdabberu
Ajay_Mishra
sven.wullum1
Vyshnavi_Nalumachu