title: sceptre create fails with ERROR : "Session credentials were not found. Profile: None. Region: us-east-1."
body: <p>I have two aws profiles in my config file like below</p>
  <pre><code>[profile projet]
  region = us-east-1
  output = json
  
  [profile accPersonal]
  region = us-east-1
  output = json
  </code></pre>
  <p>and their respective credential files like below</p>
  <pre><code>[accPersonal]
  aws_access_key_id = key_id
  aws_secret_access_key = access_key
  
  [projet]
  aws_access_key_id = key_id
  aws_secret_access_key = access_key
  </code></pre>
  <p>When I try to launch a sceptre create from command line</p>
  <pre><code>sceptre create dev/api-gateway/admin-key.yaml
  </code></pre>
  <p>I get the following error</p>
  <pre><code>ERROR : &quot;Session credentials were not found. Profile: None. Region: us-east-1.&quot;
  </code></pre>
  <p>I used this command before multiple times to create resources in aws using sceptre and never had this issue,
  checked in the aws docs for configuring profiles, the configuration looks correct and I dont seem to understand why am getting that error</p>