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I think it's means the subcircuit "sram" you defined have 60 nodes.but when you call the subcircuit.you only define the 34 node.
the syntax of subcircuit definition is :
.subckt CircuitName node1 node2 ......noden
the syntax of call the subcircuit is:
Xn node1 node2 .....noden SubcktName
That's means the number of the node you call a subciruit must same as the subcircuit definition.