Tensorflow error: Invalid argument: shape must be a vector

I was trying out tensorflow with the Titanic data from Kaggle:https://www.kaggle.com/c/titanic

Here's the code I tried to implement from Sendex:https://www.youtube.com/watch?v=PwAGxqrXSCs&index=46&list=PLQVvvaa0QuDfKTOs3Keq_kaG2P55YRn5v#t=398.046664

import tensorflow as tf
import cleanData
import numpy as np

train, test = cleanData.read_and_clean()
train = train[['Pclass', 'Sex', 'Age', 'Fare', 'Child', 'Fam_size', 'Title', 'Mother', 'Survived']]

# one hot
train['Died'] = int('0')
train["Died"][train["Survived"] == 0] = 1

print(train.head())

n_nodes_hl1 = 500
n_classes = 2
batch_size = 100

# tf graph input
x = tf.placeholder("float", [None, 8])
y = tf.placeholder("float")

def neural_network_model(data):

    hidden_layer_1 = {'weights':tf.Variable(tf.random_normal([8, n_nodes_hl1])),
                      'biases':tf.Variable(tf.random_normal(n_nodes_hl1))}

    output_layer = {'weights':tf.Variable(tf.random_normal([n_nodes_hl1, n_classes])),
                    'biases':tf.Variable(tf.random_normal([n_classes]))}

    l1 = tf.add(tf.matmul(data, hidden_layer_1['weights']), hidden_layer_1['biases'])
    l1 = tf.nn.relu(l1)

    output = tf.matmul(l1, output_layer['weights']) + output_layer['biases']

    return output

def train_neural_network(x):
    prediction = neural_network_model(x)
    cost = tf.reduce_mean( tf.nn.softmax_cross_entropy_with_logits(prediction,y))
    optimizer = tf.train.AdamOptimizer().minimize(cost)

    desired_epochs = 10

    with tf.Session() as sess:
        sess.run(tf.initialize_all_variables())

        for epoch in range(desired_epochs):
            epoch_loss = 0
            for _ in range(int(train.shape[0])/batch_size):
                x_epoch, y_epoch = train.next_batch(batch_size)
                _, c = sess.run([optimizer, cost], feed_dict= {x:x, y:y})
                epoch_loss += c
            print('Epoch', epoch, 'completed out of', desired_epochs, 'loss:', epoch_loss)

        correct = tf.equal(tf.argmax(prediction,1), tf.argmax(y,1))
        accuracy = tf.reduce_mean(tf.cast(correct, 'float'))
        print('Training accuracy:', accuracy.eval({x:x, y:y}))



train_neural_network(x)

When I ran the code I got an error that said: "W tensorflow/core/framework/op_kernel.cc:909] Invalid argument: shape must be a vector of {int32,int64}, got shape []"

Is there a way around this? I saw a post on Github for tensorflow's code and apparently the library doesn't take pandas dataframe as an input..