WiShieldmaster/uip.h:1213: error: 'uip_tcp_appstate_t' does not name a type

[SdeBerg]

When I test my sketch I get this error:

In file included from Sketch.ino:9:
C:\Users\Sarita\Documents\Arduino\libraries\WiShieldmaster/uip.h:1213: error: 'uip_tcp_appstate_t' does not name a type

How can I solve this?