how to solve ValueError: Graph disconnected: cannot obtain value for tensor Tensor("input_11:0", shape=(None, 18, 1025, 1), dtype=float32) at layer "conv2d_24". The following previous layers were accessed without issue: [] code example

Example: ValueError: Graph disconnected: cannot obtain value for tensor Tensor("input_3_1:0", shape=(None, None, 71), dtype=float32) at layer "input_3". The following previous layers were accessed without issue: []

ValueError: Graph disconnected: cannot obtain value for tensor Tensor("input_3_1:0", shape=(None, None, 71), dtype=float32) at layer "input_3". The following previous layers were accessed without issue: []