Внутренняя ошибка сервера происходит с методом ajax POST в laravel?

 $(document).ready(function() {
$(".price").click(function() {
$("input").keyup(function () {
if ($(this).val()) {
$("#priceSave").show();
}
else {
$("#priceSave").hide();
}
});
});
});

<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<div class="price">
<!--<form name="priceform" method="post" action="addPriceDetails/{{$dataId}}">-->
<div class="modal fade" id="price">

<div class="modal-dialog">
<div class="modal-content">
<div class="modal-header">
<button type="button" class="close" data-dismiss="modal"><span aria-hidden="true">×</span><span class="sr-only">Close</span>
</button>
<h4 class="modal-title">Selling Information</h4>
</div>

<div class="modal-body" id="modal-content">

<input type="hidden" name="_token" value="{{ csrf_token() }}">
<div class="row">
<div class="col-sm-12">
<b>Listing Information</b>
<h6>Seller SKU ID  <a href="#" class='my-tool-tip' data-toggle="tooltip" data-placement="right" title="Unique identifier for the listings">
<span class="glyphicon glyphicon-info-sign" style="color:
#337AB7"></span>
</a></h6>
<input type="text" name="skuid" id="skuvalue" class="pricevalue" />
</div>
</div>
<br/>
<br/>
<div class="row">
<div class="col-sm-12">
<b>Status Details</b>
<h6>Listing Status  <a href="#" class='my-tool-tip' data-toggle="tooltip" data-placement="right" title="Inactive listings are not available for buyers on Flipkart">
<span class="glyphicon glyphicon-info-sign" style="color:#337AB7"></span>
</a></h6>
<select id="dropDownId" name="listingStatus">
<option selected disabled>--Choose here--</option>
<option value="Active">Active</option>
<option value="Inactive">Inactive</option>
</select>
</div>
</div>
<br/>
<br/>
<div class="row">
&nbsp;&nbsp;&nbsp;&nbsp;<b>Price Details</b>
<div class="col-sm-12">
<div class="col-sm-6">
<h6>MRP  <a href="#" class='my-tool-tip' data-toggle="tooltip" data-placement="right" title="Maximum retail price of the product">
<span class="glyphicon glyphicon-info-sign" style="color:
#337AB7"></span>
</a></h6>
<input type="text" name="mrp" id="mrpvalue" class="check-fill"/>
</div>
<div class="col-sm-6">
<h6>Your Selling Price   <a href="#" class='my-tool-tip' data-toggle="tooltip" data-placement="right" title="Price at which you want to sell this listing">
<span class="glyphicon glyphicon-info-sign" style="color:#337AB7"></span>
</a></h6>
<input type="text" name="selprice" id="selpricevalue" class="check-fill"/>
</div>
</div>
</div>
<br/>
<br/>
<div class="row">
&nbsp;&nbsp;&nbsp;&nbsp;<b>Inventory Details</b>
<div class="col-sm-12">
<div class="col-sm-6">
<h6>Fulfilment By  <a href="#" class='my-tool-tip' data-toggle="tooltip" data-placement="right" title="Fullfilment of FA listings will be managed by Flipkart ">
<span class="glyphicon glyphicon-info-sign" style="color:
#337AB7"></span>
</a></h6>
<select id="5" name="fulfillment">
<option selected disabled>Choose here</option>
<option value="Seller">Seller</option>
</select>
<br/>
<h6>Procurement SLA  <a href="#" class='my-tool-tip' data-toggle="tooltip" data-placement="right" title="Time required to keep the product ready for dispatch">
<span class="glyphicon glyphicon-info-sign" style="color:#337AB7"></span>
</a></h6>
<input type="text" name="sla" class="check-fill"/>Days
<br/>
<h6>Stock available for Buyers  <a href="#" class='my-tool-tip' data-toggle="tooltip" data-placement="right" title="Number of items available for cutomer to buy after detecting pending orders" >
<span class="glyphicon glyphicon-info-sign" style="color:
#337AB7"></span>
</a></h6>
<input type="text" name="available" readonly/>
</div>
<div class="col-sm-6">
<h6>Procurement Type  <a href="#" class='my-tool-tip' data-toggle="tooltip" data-placement="right" title="Information on how the inventory is procured by the seller to fulfill an order">
<span class="glyphicon glyphicon-info-sign" style="color:#337AB7"></span>
</a></h6>
<select name="procurementType">
<option selected disabled>--Choose here--</option>
<option value="instock">instock</option>
</select>
<br/>
<h6>Stock  <a href="#" class='my-tool-tip' data-toggle="tooltip" data-placement="right" title="Number of items you have in stock">
<span class="glyphicon glyphicon-info-sign" style="color:
#337AB7"></span>
</a></h6>
<input type="text" name="stock" />
<br/>
</div>
</div>
</div>
<br/>
<br/>
<div class="row">
&nbsp;&nbsp;&nbsp;&nbsp;<b>Delivery charge to customer</b>
<div class="col-sm-12">
<div class="col-sm-4">
<h6>Local Delivery Charge  <a href="#" class='my-tool-tip' data-toggle="tooltip" data-placement="right" title="Delivery charge you want charge a buyer in the same city for listings which are not Flipkart Assured">
<span class="glyphicon glyphicon-info-sign" style="color:#337AB7"></span>
</a></h6>
<input type="text" name="local" />
</div>
<div class="col-sm-4">
<h6>Zonal Delivery Charge  <a href="#" class='my-tool-tip' data-toggle="tooltip" data-placement="right" title="Delivery charge you want charge a buyer in the same zone for listings which are not Flipkart Assured">
<span class="glyphicon glyphicon-info-sign" style="color:
#337AB7"></span>
</a></h6>
<input type="text" name="zonal" />
</div>
<div class="col-sm-4">
<h6>National Delivery Charge  <a href="#" class='my-tool-tip' data-toggle="tooltip" data-placement="right" title="Delivery charge you want charge a buyer outside your zone for listings which are not Flipkart Assured">
<span class="glyphicon glyphicon-info-sign" style="color:#337AB7"></span>
</a></h6>
<input type="text" name="national" />
</div>
</div>
</div>
<br/>
<br/>
<div class="row">
&nbsp;&nbsp;&nbsp;&nbsp;<b>Packaging Details</b>
<div class="col-sm-12">
<div class="col-sm-3">
<h6>Package Weight  <a href="#" class='my-tool-tip' data-toggle="tooltip" data-placement="right" title="Weight of the final package in kgs">
<span class="glyphicon glyphicon-info-sign" style="color:
#337AB7"></span>
</a></h6>
<input type="text" name="weight" />Kgs
</div>
<div class="col-sm-3">
<h6>Package Length  <a href="#" class='my-tool-tip' data-toggle="tooltip" data-placement="right" title="Length of the final package in cms">
<span class="glyphicon glyphicon-info-sign" style="color:#337AB7"></span>
</a></h6>
<input type="text" name="length" />cms
</div>
<div class="col-sm-3">
<h6>Package Breadth  <a href="#" class='my-tool-tip' data-toggle="tooltip" data-placement="right" title="Breadth of the final package in cms">
<span class="glyphicon glyphicon-info-sign" style="color:
#337AB7"></span>
</a></h6>
<input type="text" name="breadth" />cms
</div>
<div class="col-sm-3">
<h6>Package Height  <a href="#" class='my-tool-tip' data-toggle="tooltip" data-placement="right" title="Height of the final package in cms">
<span class="glyphicon glyphicon-info-sign" style="color:#337AB7"></span>
</a></h6>
<input type="text" name="height" />cms
</div>
</div>
</div>
<br/>
<br/>
<div class="row">
<div class="col-sm-12">
<b>Tax Details</b>
<h6>HSN  <a href="#" class='my-tool-tip' data-toggle="tooltip" data-placement="right" title="code of your product for determining applicable tax rates">
<span class="glyphicon glyphicon-info-sign" style="color:
#337AB7"></span>
</a></h6>
<input type="text" name="hsn" />
<a href="#">Find relevant HSN codes</a>
</div>
</div>
<br/>
<br/>
<input type="submit" id="priceSave" class="save" value="Save" style="border-radius: 8px; padding: 5px 15px; display:none;">
<!-- </form>-->
</div>
<div class="modal-footer">
<button type="button" class="btn btn-info" data-dismiss="modal">Close</button>
<!--<button type="submit" id="priceSave" class="save" style="border-radius: 8px; padding: 5px 15px; display:none;">Save</button>-->
</div>

</div>
<!-- /.modal-content -->
</div>
<!-- /.modal-dialog -->
</div>
</div>