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When I write some code in formula with any database field and save it I got nothing error appear, but while run time when generating report I got this error message. (VB.Net) anyone help me please, thanks in advance<a href="https://filedb.experts-exchange.com/incoming/2017/05_w21/1164737/nb.PNG" target="_blank" title="nb.PNG (14 KB)"><img alt="nb.PNG" class="file-block lazyload" style="max-width: 468px;" data-src="https://filedb.experts-exchange.com/incoming/2017/05_w21/1164737/nb.PNG" /></a>
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When I write some code in formula with any database field and save it I got nothing error appear, but while run time when generating report I got this error message. (VB.Net) anyone help me please, thanks in advance

ErrorKind in crystal reprot VB.Net

Visual Basic .NET (VB.NET) is an object-oriented programming language implemented on the .NET framework, but also supported on other platforms such as Mono and Silverlight. Microsoft launched VB.NET as the successor to the Visual Basic language. Though it is similar in syntax to  Visual Basic pre-2002, it is not the same technology,

Visual Basic.NET

Databases are organized collections of data, most commonly accessed through management systems including schemas, tables, queries and processes that allow users to enter and manipulate the information or utilize it in other fashions, such as with web applications or for reporting purposes.

Databases

Crystal Reports is a business intelligence application from SAP SE. It is used to graphically design data connections and report layouts from a wide range of data sources including Excel spreadsheets, Oracle, SQL Server databases and Access databases, BusinessObjects Enterprise business views, and local file-system information. Report designers can place fields from these sources on the report design surface, and can also deploy them in custom formulas (using either BASIC or Crystal's own syntax), which are then placed on the design surface. Crystal Reports also supports subreports, graphing, and a limited amount of GIS functionality.

Crystal Reports

Microsoft SQL Server is a suite of relational database management system (RDBMS) products providing multi-user database access functionality.SQL Server is available in multiple versions, typically identified by release year, and versions are subdivided into editions to distinguish between product functionality. Component services include integration (SSIS), reporting (SSRS), analysis (SSAS), data quality, master data, T-SQL and performance tuning.