Decoding "admin_ssh_key.0.public_key" for public key data

Hi Everyone,

I am learning terraform and i want to create linuxvm on azure but i got one error.

Error: decoding "admin_ssh_key.0.public_key" for public key data
│
│   with azurerm_linux_virtual_machine.linux-vm,
│   on main.tf line 126, in resource "azurerm_linux_virtual_machine" "linux-vm":
│  126: resource "azurerm_linux_virtual_machine" "linux-vm" {
│

Below is the configuration

//*********************************************************************
#declaration of local variables
locals {
  resource_group_name="app-grp"
  location="Central India"
  virtual_network={
    name="appnetwork"
    address_space="10.0.0.0/16" # ip address space
  }
  subnets=[
  {
    name="subnetA"
    address_prefix="10.0.0.0/24"
  },
  {
    name="subnetB"
    address_prefix="10.0.1.0/24"
  }
  ]
}

#create resource group
resource "azurerm_resource_group" "appgrp" {
  name     = local.resource_group_name
  location = local.location
}

# create virtual network
resource "azurerm_virtual_network" "appnetwork" {
  name                = local.virtual_network.name
  location            = local.location
  resource_group_name = local.resource_group_name
  address_space       = [local.virtual_network.address_space]
 
 
depends_on = [ azurerm_resource_group.appgrp ]
 }
# subnet creation
 resource "azurerm_subnet" "subnetA" {
  name                 = local.subnets[0].name
  resource_group_name  = local.resource_group_name
  virtual_network_name = local.virtual_network.name
  address_prefixes     = [local.subnets[0].address_prefix]
  depends_on = [azurerm_virtual_network.appnetwork]
 
}
#subnet creation
 resource "azurerm_subnet" "subnetB" {
  name                 = local.subnets[1].name
  resource_group_name  = local.resource_group_name
  virtual_network_name = local.virtual_network.name
  address_prefixes     = [local.subnets[1].address_prefix]
  depends_on = [azurerm_virtual_network.appnetwork]
 
}
# network interface creation
resource "azurerm_network_interface" "appinterface" {
  name                = "appinterface"
  location            = local.location
  resource_group_name = local.resource_group_name

  ip_configuration {
    name                          = "internal"
    subnet_id                     = azurerm_subnet.subnetA.id
    private_ip_address_allocation = "Dynamic"
    public_ip_address_id = azurerm_public_ip.app_ip.id
  }
  depends_on = [ azurerm_subnet.subnetA ]
  
}

/*
output "subnets_info" {
  value = tolist(azurerm_virtual_network.appnetwork.subnet)[0].id
}
*/
# assignment of public ip to network interface
resource "azurerm_public_ip" "app_ip" {
  name                = "app-ip"
  resource_group_name = local.resource_group_name
  location            = local.location
  allocation_method   = "Static"
  //sku = "Basic"
depends_on = [ azurerm_resource_group.appgrp ]
}


# network security group 
resource "azurerm_network_security_group" "appnsg" {
  name                = "app-nsg"
  location            = local.location
  resource_group_name = local.resource_group_name

  security_rule {
    name                       = "AllowSSH"
    priority                   = 300
    direction                  = "Inbound"
    access                     = "Allow"
    protocol                   = "Tcp"
    source_port_range          = "*"
    destination_port_range     = "22"
    source_address_prefix      = "*"
    destination_address_prefix = "*"
  }
depends_on = [ azurerm_resource_group.appgrp ]
}

# association of network security group with a subnets
resource "azurerm_subnet_network_security_group_association" "nsglink" {
  subnet_id                 = azurerm_subnet.subnetA.id
  network_security_group_id = azurerm_network_security_group.appnsg.id
}
#private key
resource "tls_private_key" "linux-key" {
  algorithm = "RSA"
  rsa_bits  = 4096
}
# creates file
resource "local_file" "linuxpemkey" {
  content  = tls_private_key.linux-key.private_key_pem
  filename = "linuxkey.pem"
  depends_on = [ tls_private_key.linux-key ]
}
# creates window virtual machine
resource "azurerm_linux_virtual_machine" "linux-vm" {
  name                = "linux-vm"
  resource_group_name = local.resource_group_name
  location            = local.location
  size                =  "Standard_DS1_v2" #"Standard_D2s_v3" 
  admin_username      = "linuxuser"
  network_interface_ids = [
    azurerm_network_interface.appinterface.id
  ]
 admin_ssh_key {
    username   = "linuxuser"
    public_key = tls_private_key.linux-key.private_key_openssh
  }
  os_disk {
    caching              = "ReadWrite"
    storage_account_type = "Standard_LRS"
  }

  source_image_reference {
    publisher = "RedHat"
    offer     = "RHEL"
    sku       = "87-gen2"
    version   = "latest"
  }
  depends_on = [ azurerm_network_interface.appinterface ,
                 azurerm_resource_group.appgrp,
                 tls_private_key.linux-key

  ]
}

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