Extension doesn´t work after deleted Cache - caching

Question

i have a problem with one of my extensions i created with Extensionbuilder.
After i deleted the Cache there is no content anymore!
<f:flashMessages renderMode="div"/>
<div class="tx-camping-list">
<f:for each="{offers}" as="offer" iteration="it">
<div class="content-list-item">
<div class="contentLeft floatLeft">
<f:render partial="BaseItem/ListImages" arguments="{item:offer}" />
<div class="wrap-right floatRight">
<h3>
<f:link.action arguments="{offer:offer}">
<f:format.raw>{offer.names}</f:format.raw>
</f:link.action>
</h3>
<h4>
<f:format.raw>{offer.teaser}</f:format.raw>
</h4>
<div class="description"><f:format.crop maxCharacters="240"><f:format.html>{offer.description}</f:format.html></f:format.crop>
<p>
<f:link.action arguments="{offer:offer}">
<f:translate key="read_more" default="Read more" /> >
</f:link.action>
</p>
</div>
</div>
</div>
<div class="roomPrice floatRight">
<f:render partial="Price/ListPriceBox" arguments="{item:offer}" />
<f:render partial="BaseItem/Button" arguments="{item:offer,type:'Offer'}"/>
</div>
<div class="clearFloat"></div>
</div>
</f:for>
</div>
The image, {offer.names}, {offer.teaser} etc. is NULL, BUT the link {offer:offer} is working
When i reload the page the first time after i deleted the Cache i get the error:
The argument “each” was registered with type “array”, but is of type “string” in view helper
After a reload everything works fine except this plugin!
Maybe some of you can help me
Thanks

Answer 1

Use <f:debug> to find out what you real values are. You cannot loop over a string. Most likely, you are mistaken over your nesting level of your object.
Also do not use <f:format.raw> unless you already ensured, that the contend is htmlspecialchar'd. Otherwise you loose the XSS protection.

Answer 2

This can just fix the error if its caused by a missing reference on records
You could try to add the following line of code to your setup.ts (or .txt; depending on configuration and personal preferences):
File: slider/Configuration/TypoScript/setup.ts:
plugin.tx_slider.persistence.storagePid = 15
Note: replace tx_slider with your extensionkey and the 15 with the pagenumber where your records (in this case your offer-records) are located