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What does the error "Software Incompatibility" mean?

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When isCOBOL Client connects to an isCOBOL Server, the following error may appear:

   Software Incompatibility
   Client release (###) is incompatible with Application Server (###)
This error means that the isCOBOL Client version is different from the isCOBOL Server version and therefore it's not compatible.
The number in parenthesis identifies the isCOBOL version. table:

number
isCOBOL version
17
2011 R3
18
2012 R1
20
2012 R2
21
2013 R1
25
2013 R2
29
2014 R1
31
2015 R1
35
2016 R1
36
2016 R2
46
2017 R1
51
2017 R2
57
2018 R1
59
2018 R2
61
2019 R1
64
2019 R2
71
2020 R1
74
2020 R2
78
2021 R1
83
2021 R2
86
2022 R1
89
2022 R2
91
2023 R1
93
2023 R2
95
2024 R1

Note - the above numbers refers to the GA release of each isCOBOL version. Numbers in between those listed here refer to Alpha and Beta builds.

Ensure that isCOBOL Client and isCOBOL Server are the same version to successfully run applications.

What does the error "Software Incompatibility" mean?