Help - AltSoftSerial doesn't work on Arduino D1 Rev2 ESP8266 module

Hello evryone :grin:
I am using Arduino IDE 1.9.0 beta, and i have problem with uploading AlSoftSerial.h to my arduino d1 esp8266 module. I got error :

C:\Users\User\Documents\Arduino\libraries\AltSoftSerial\config/AltSoftSerial_Boards.h:136:2: error: #error "Please define your board timer and pins"

 #error "Please define your board timer and pins"


Is there some alternatives for AltSoftSerial? I want to use AI A6 GSM module with standard serial comunicatio for debuging and atsoftserial for gsm module. Thanks anyway

esp8266 has a SoftwareSerial library. the AltSoftSerial library doesn't support esp8266