Syntax error

There was a syntax error.

I was expecting one of these:

• A variable at: "

  (λt.+t+t+(λh+f+n.+n+h+f+n)+t+t+t)+(λf+x.+f+(f+x))

  "
• An integer at: "

  (λt.+t+t+(λh+f+n.+n+h+f+n)+t+t+t)+(λf+x.+f+(f+x))

  "
• A variable at: "

  (λt.+t+t+(λh+f+n.+n+h+f+n)+t+t+t)+(λf+x.+f+(f+x))

  "
• The symbol: "(" at: "

  (λt.+t+t+(λh+f+n.+n+h+f+n)+t+t+t)+(λf+x.+f+(f+x))

  "
• The symbol: "\" at: "

  (λt.+t+t+(λh+f+n.+n+h+f+n)+t+t+t)+(λf+x.+f+(f+x))

  "
• The symbol: "λ" at: "

  (λt.+t+t+(λh+f+n.+n+h+f+n)+t+t+t)+(λf+x.+f+(f+x))

  "