error when loading a mat file

Hi,

I am simple trying to load a mat file called Step1 that has only two variables t20142018 and opts.When dowloading the file I receive a strange error. What could be the reason? I want to use opts to export excel files in other folders and I need to maintina the consistency. So I am afraid of chanfing anything in the opts variables that could affect my other imports.

opts = detectImportOptions(File);    
A = readtable(File,opts); %   
save step1 t20142018 opts
clear all
load step1

Error using matlab.io.DatetimeVariableImportOptions/set.Type (line 130)

Type cannot be set for datetime import options.

Use the setvartype function to change the variable type. For example,

opts = setvartype(opts, '', 'datetime')

Error in Step1_20142018 (line 25)

load step1

[madhan ravi]

upload your mat file

[Wesso]

the file is 45 mb,which doesn't allow me to upload it . and I can't open it since it gives error.