Warning: fclose() expects parameter 1 to be resource

I am running OC 2.3.02 on an IIIS server
Unfortunately pages are generating this error

Warning: fclose() expects parameter 1 to be resource, boolean given in D:\CustomerData\webspaces\webspace_00103408\wwwroot\Shop\system\library\log.php on line 14Warning: fclose() expects parameter 1 to be resource, boolean given in D:\CustomerData\webspaces\webspace_00103408\wwwroot\Shop\system\library\log.php on line 14

Logging ito my admin dashboard I get the following related but more extensive popup:

SyntaxError: JSON.parse: unexpected non-whitespace character after JSON data at line 1 column 869 of the JSON data

OK

{"order":{"label":"Orders","data":[[1,0],[2,0],[3,0],[4,0],[5,0],[6,0],[7,0],[8,0],[9,0],[10,0],[11,0],[12,0],[13,0],[14,0],[15,0],[16,0],[17,0],[18,0],[19,0],[20,0],[21,0],[22,0],[23,0],[24,0],[25,0],[26,0],[27,0],[28,0],[29,0],[30,0],[31,0]]},"customer":{"label":"Customers","data":[[1,0],[2,0],[3,0],[4,0],[5,0],[6,0],[7,0],[8,0],[9,0],[10,0],[11,0],[12,0],[13,0],[14,0],[15,0],[16,0],[17,0],[18,0],[19,0],[20,0],[21,0],[22,0],[23,0],[24,0],[25,0],[26,0],[27,0],[28,0],[29,0],[30,0],[31,0]]},"xaxis":[["1","01"],["2","02"],["3","03"],["4","04"],["5","05"],["6","06"],["7","07"],["8","08"],["9","09"],["10","10"],["11","11"],["12","12"],["13","13"],["14","14"],["15","15"],["16","16"],["17","17"],["18","18"],["19","19"],["20","20"],["21","21"],["22","22"],["23","23"],["24","24"],["25","25"],["26","26"],["27","27"],["28","28"],["29","29"],["30","30"],["31","31"]]}<b>Warning</b>: fclose() expects parameter 1 to be resource, boolean given in <b>D:\CustomerData\webspaces\webspace_00103408\wwwroot\Shop\system\library\log.php</b> on line <b>14</b><b>Warning</b>: fclose() expects parameter 1 to be resource, boolean given in <b>D:\CustomerData\webspaces\webspace_00103408\wwwroot\Shop\system\library\log.php</b> on line <b>14</b>

On dismissing that popup there is an underlying popup

SyntaxError: JSON.parse: unexpected non-whitespace character after JSON data at line 1 column 3 of the JSON data

OK

[]<b>Warning</b>: fclose() expects parameter 1 to be resource, boolean given in <b>D:\CustomerData\webspaces\webspace_00103408\wwwroot\Shop\system\library\log.php</b> on line <b>14</b><b>Warning</b>: fclose() expects parameter 1 to be resource, boolean given in <b>D:\CustomerData\webspaces\webspace_00103408\wwwroot\Shop\system\library\log.php</b> on line <b>14</b>

I'm not a Windows server expert but it appears to be a file permission issue. You may need to consult with your web hosting company support to resolve this.

I have exactly the same problem. I changed the permissions to all folders and files on 777, established the owner and group, but the problem does not disappear.