Create graph with plt.pcolormesh

Question

I am trying to create a graph to visualize current speeds. I have put the following code:

plt.figure(figsize=(14,2))
plt.pcolormesh(tempo1,niveis,np.transpose(v1u))
plt.title('v1')
plt.plot(tempo1,media1,'r')
plt.show() 

Where time data 1, media1 and v1u are a list, each has a column containing 360 rows.

and the following error was generated:

ValueError: not enough values to unpack (expected 2, got 1)

Can someone help me what I’m doing wrong