The configuration I want to achieve is for learning reasons, in Cisco packet tracer, not a real-life scenario:
I have one router, two switches connected to them. Each switch has multiple computers connected to them, some of which are in one VLAN, some are in another VLAN. If I understand correctly, computers in the same VLAN should also be in the same subnetwork, but this is unachievable, because trying this configuration results in an error (on the router):

interface g0/0.5
encapsulation dot1q 5
ip address [ip of vlan 5] 255.255.255.0
interface g0/0.10
encapsulation dot1q 10
ip address [ip of vlan 10] 255.255.255.0

Then I did this for g0/1 interface, too, which resulted in an error. Is what I'm trying to do possible at all? If yes, what did I do wrong and how do I fix it (besides putting the computers of VLAN 5 under switch 1 and putting the computers of VLAN 10 under switch two)?

The configuration I want to achieve is for learning reasons, in Cisco packet tracer, not a real-life scenario:

I have one router and two switches connected to them. Each switch has multiple computers connected to them, some of which are in one VLAN, some are in another VLAN. If I understand correctly, computers in the same VLAN should also be in the same subnetwork, but this is unachievable, because trying this configuration results in an error (on the router):

interface g0/0.5  
 encapsulation dot1q 5  
 ip address [ip of vlan 5] 255.255.255.0  
interface g0/0.10  
 encapsulation dot1q 10  
 ip address [ip of vlan 10] 255.255.255.0

Then I did this for g0/1 interface, too, which resulted in an error. Is what I'm trying to do possible at all? If yes, what did I do wrong and how do I fix it (besides putting the computers of VLAN 5 under switch 1 and putting the computers of VLAN 10 under switch two)?

The configuration I want to achieve is for learning reasons, in cisco packet tracer, not a real-life scenario:
I have one router, two switches connected to them. Each switch has multiple computers connected to them, some of which are in one vlan, some are in another vlan. If I understand correctly, computers in the same vlan should also be in the same subnetwork, but this is unachievable, because trying this configuration results in an error (on the router):

interface g0/0.5
encapsulation dot1q 5
ip address [ip of vlan 5] 255.255.255.0
interface g0/0.10
encapsulation dot1q 10
ip address [ip of vlan 10] 255.255.255.0

Then I did this for g0/1 interface, too, which resulted in an error. Is what I'm trying to do possible at all? If yes, what did I do wrong and how do I fix it (besides putting the computers of vlan 5 under switch 1 and putting the computers of vlan 10 under switch two)?

The configuration I want to achieve is for learning reasons, in Cisco packet tracer, not a real-life scenario:
I have one router, two switches connected to them. Each switch has multiple computers connected to them, some of which are in one VLAN, some are in another VLAN. If I understand correctly, computers in the same VLAN should also be in the same subnetwork, but this is unachievable, because trying this configuration results in an error (on the router):

interface g0/0.5
encapsulation dot1q 5
ip address [ip of vlan 5] 255.255.255.0
interface g0/0.10
encapsulation dot1q 10
ip address [ip of vlan 10] 255.255.255.0

Then I did this for g0/1 interface, too, which resulted in an error. Is what I'm trying to do possible at all? If yes, what did I do wrong and how do I fix it (besides putting the computers of VLAN 5 under switch 1 and putting the computers of VLAN 10 under switch two)?