HD44780 LCD Display Timeout Error

Tried it again on I2C1 b6/b7 , got a slightly different error message this time:

 ____                 _
|  __|___ ___ ___ _ _|_|___ ___
|  __|_ -| . |  _| | | |   | . |
|____|___|  _|_| |___|_|_|_|___|
         |_| espruino.com
 2v07 (c) 2019 G.Williams
>Uncaught InternalError: Timeout on I2C Write BUSY
 at line 1 col 111
...|4,a|4,a,a,d,d,d|4,d|4,d,d])
                              ^
in function "a" called from line 1 col 7
a(51,1),a(50,1),a(40,1),a(12,1),a(6,1),a(1,1),{write:a,clear...
      ^
in function "a" called from line 1 col 133
...,a|4,a,a,d,d,d|4,d|4,d,d])})
                              ^
in function "connectI2C" called from line 1 col 807
...('HD44780').connectI2C(I2C1);lcd.print('Hello World!')