Problem with trigger error Cannot evaluate expression

[ltep]

I'm having difficulties finding the error in this expression.

The host has 3 macros:

• {$ICMP_RESPONSE_TIME_WARN} = 0.15
• {$ICMP_LOSS_WARN} = 20
• {$INTERFACE} = 192.168.1.1

3 items:

• Name: ICMP loss (interface {$INTERFACE} firewall)
  Key: icmppingloss[{$INTERFACE}]
  Type: Numeric (float)
• Name: ICMP ping (interface {$INTERFACE} firewall)
  Key: icmpping[{$INTERFACE}]
  Type: Numeric (unsigned)
• Name: ICMP response time (interface {$INTERFACE} firewall)
  Key: icmppingsec[{$INTERFACE}]
  Type: Numeric (float)

trigger:

• Name: Interface {$INTERFACE} - High ICMP ping loss
  Operational data: Loss: {ITEM.LASTVALUE1}
  Expression: min(/host/icmppingloss[{$INTERFACE}],5m)>{$ICMP_LOSS_WARN} and
  min(/host/icmppingloss[{$INTERFACE}],5m)<100
  
  This trigger is in errorstate with info: Cannot evaluate expression: right operand "$ICMP_LOSS_WARN" is not a numeric value for operator at ">"$ICMP_LOSS_WARN""
  While the macro has a numeric value. I don't understand...