What does this error msg mean

MY CODE
// Try to move left
if (c > 0 && maze[r][c-1] = false && beenThere[r][c-1] != 0)
addPosition(r+1, c-1);
THE ERROR MESSAGE
QSearch.java:96: unexpected type
required: variable
found : value
if (c > 0 && maze[r][c-1] = false && beenThere[r][c-1] != 0)
^
1 error

Trying again, with the preview button...
maze[r][c-1] == false

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